Ditch Your Athlete's Toxic Underwear

Protect your kid's hormone health from plastics and forever chemicals with certified-safe, plastic-free merino wool sports briefs that keep them cool, dry, and chafe-free all game long.

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Zero Plastics & Forever Chemicals

Zero Plastics & Forever Chemicals

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Zero Plastics & Forever Chemicals

Protect Their Testosterone

Protect Their Testosterone

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Zero Plastics & Forever Chemicals

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Zero Plastics & Forever Chemicals

Protect Their Testosterone

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Zero Plastics & Forever Chemicals

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Protect Their Testosterone

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DID YOU KNOW THIS ABOUT [[BLUE-TEXT]]POLYESTER?[[/BLUE-TEXT]]

Breaking news

Microplastics found in every human testicle

High levels of toxic chemicals found in polyester

Wearing polyester hurts your kid's fertility

Synthetic underwear sling forces male infertility

Microplastics found in every human testicle

Wearing polyester hurts your kid's fertility

Wearing Polyester Kills Your Sperm Count

Synthetic underwear sling forces male infertility

77%

Of men tested had microplastics in their bloodstream.

Reported By

3X

Sweaty skin can absorb roughly three times more chemicals from fabrics than dry skin.

Reported By

100%

Study finds polyester underwear linked to infertility: 100% of subjects affected!

Reported By

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Attack Sports Performance Boxer Briefs

99 total reviews

Regular price $34.00
Unit price per

Your athlete’s health starts with what touches their skin. These lab-certified 100% merino wool boxer briefs deliver plastic-free comfort that stays cool, dry, and chafe-free—practice after practice. Show your family what real performance underwear is supposed to feel like.

Color:
Size
30 Day Money Back Icon

30 Day Money Back Guarantee

Boosts Testosterone

Boosts Testosterone

Supports Gut & Hormone Health

Supports Gut & Hormone Health

Protects Fertility

Protects Fertility

Sizing Chart

Materials & Product Care

Material:

Attack Briefs are made from 100% GOTS-Certified Organic Merino Wool — sourced from real sheep 🐑. Unlike synthetic performance underwear that relies on plastic-based fabrics treated with chemicals, our merino wool is a natural, renewable fiber that works with your child's body rather than against it. The wool comes from ethically raised sheep and is processed without the use of toxic chemicals, synthetic pesticides, or harmful dyes.

Recommended care:

  • Machine wash on cold with gentle/delicate cycle
  • Use a mild detergent (preferably wool-safe or eco-friendly)
  • Tumble dry on low heat or lay flat to dry

Do NOT:

  • Use bleach
  • Use fabric softener (coats fibers and reduces performance)
  • Wash with rough fabrics (jeans, zippers, Velcro)
  • Use high heat drying

US VS THEM

AttackleticsATTACKLETICS

Conventional Underwear

Right

GOTS CERTIFIED 100% MERINO WOOL

Wrong

POLYESTER, NYLON, ELASTANE

Right

LAB-PROVEN NO PLASTICS OR SHEDDING

Wrong

FABRICS SHED MICROPLASTICS

Right

FREE OF ENDOCRINE DISRUPTING CHEMICALS

Wrong

CONTAINS HORMONE DISRUPTORS

Right

NATURALLY ANTIBACTERIAL

Wrong

TRAPS SWEAT & BACTERIA

Right

NATURAL TEMPERATURE REGULATION

Wrong

RETAINS HEAT WHEN WORKING HARD

Right

SWEAT-WICKING & FAST DRYING

Wrong

ACTUALLY RETAINS MOISTURE

10 Reasons Why Your Athlete Needs to

Switch Underwear ASAP

1. Your Kid's Skin Eats What They Wear

1. Your Kid's Skin Eats What They Wear

You kid's skin isn't a barrier, it's a sponge. When they sweat, their pores open up, and plastics and forever chemicals from their apparel leaks chemicals straight into their body. Just like moisturizer, but loaded with toxins.

2. Polyester Was Never Meant for Humans

2. Polyester Was Never Meant for Humans

Polyester is melted plastic bottles and petroleum byproducts. 99% of the sports apparel on the market today is loaded with this and plastics and forever chemical at both the material and dye levels of production. They're not made for skin, they're made for profit.

3. Your Kid's Absorbing Chemicals You Can't Pronounce

3. Your Kid's Absorbing Chemicals You Can't Pronounce

From softeners to dyes, synthetic fabrics are soaked in toxins. These don't stay on the surface, they are absorbed into their bloodstream, especially when your athlete sweats during practices and games.

4. These Chemicals are Linked to Nightmare-Fuel Problems

4. These Chemicals are Linked to Nightmare-Fuel Problems

These chemicals are proven in peer-reviewed research to severely disrupt hormones, lower testosterone, cause future infertility, and even increase cancer risk.

5. It Gets Even Worse When They Sweat

5. It Gets Even Worse When They Sweat

Heat and movement speed up the toxic leeching process. This image shows how quickly different parts of the body absorb things through the skin, with some very sensitive areas soaking up much more than others.

6. It Pumps Microplastics Into Their Growing Bodies

6. It Pumps Microplastics Into Their Growing Bodies

Every practice or game wearing "normal" boxers or briefs floods their skin and bloodstream with microplastics, PFAS, BPA/BPS, and phthalates (AKA, forever chemicals) as sweating opens up their pores.

7. Shrinks Your Son's Balls and Hurts Future Fertility

7. Shrinks Your Son's Balls and Hurts Future Fertility

In a groundbreaking medical studies, the polyester found in almost all sports apparel was shown to cause complete infertility, dramatically reduced sperm production, and visibly shrank testicular size.

8. They All Use Cheap & Toxic Junk

8. They All Use Cheap & Toxic Junk

99% of boxer briefs and other sports apparel that your kid wears use these toxic materials and dyes because they're easy to source suppliers for and cheap to mass-produce. Brands profit while your child sweats in recycled plastic bottles, soaking in bacteria and forever chemicals.

9. Made with Care, Not Margins

9. Made with Care, Not Margins

Our boxer briefs are painstakingly independent lab-tested and fully GOTS certified plastic-free, PFAS-free, and free of BPA/BPS and phthalates, with no synthetic microplastic shedding. Tens of thousands spent on fabric and dye tests = no shortcuts and no compromises.

10. Merino Wool is the Best for Athletes

10. Merino Wool is the Best for Athletes

Certified 100% merino wool, like from real sheep, works with the body to deliver: natural odor control, fast sweat-wicking breathability, steady temperature regulation through long practices, and a soft knit that reduces chafing so they can go harder, longer.

Underwear That Supports [[BLUE-TEXT]]Growing Athletes[[/BLUE-TEXT]]

Certified 100% Merino Wool
Certified 100% Merino Wool

Zero plastics, PFAS, pesticides, or toxic dyes

Sweat-Wicking & Fast Drying
Sweat-Wicking & Fast Drying

Naturally outperforms cotton & synthetics

Literally Never Smells
Literally Never Smells

Antibacterial properties give natural odor control

Product Image
Protect & Boost Testosterone
Protect & Boost Testosterone

We don't play with your kid's development

Temperature Regulation
Temperature Regulation

Keeps your athlete cool no matter how hard they train

Zero Chafing or Rashes
Zero Chafing or Rashes

Soft-knit & skin-safe with zero forever chemicals

Certified 100% Merino Wool
Certified 100% Merino Wool

Zero plastics, PFAS, pesticides, or toxic dyes

Sweat-Wicking & Fast Drying
Sweat-Wicking & Fast Drying

Naturally outperforms cotton & synthetics

Literally Never Smells
Literally Never Smells

Antibacterial properties give natural odor control

Protect & Boost Testosterone
Protect & Boost Testosterone

We don't play with your kid's development

Temperature Regulation
Temperature Regulation

Keeps your athlete cool no matter how hard they train

Zero Chafing or Rashes
Zero Chafing or Rashes

Soft-knit & skin-safe with zero forever chemicals

Satisfaction Icon
FIT SATISFACTION GUARANTEE

Worried about how they'll fit? No Sweat! We offer a 30-day money-back guarantee!

GraphicGraphicGraphic

Why [[BLUE-TEXT]]Attack Briefs[[/BLUE-TEXT]]

We built ATTACK for one reason: to protect the next generation of athletes.

Other performance briefs are made with petro-plastic fibers and PFAS finishes-chemicals proven in peer-reviewed research to severely disrupt hormones (like lowering testosterone), cause future infertility, and even increase cancer risk.

That's not acceptable for your kid, your future grandkids, or the game. So we returned to the original high-performance fiber-certified Merino wool from actual sheep.

It's independent lab-proven to be plastic-free, PFAS-free, and free of BPA/BPS and phthalates, with no synthetic microplastic shedding.

Merino works with the body to deliver: natural odor control, fast sweat-wicking breathability, steady temperature regulation through long practices, and a soft knit that reduces chafing so they can go harder, longer.

As parents and coaches, we're raising the standard in youth sports apparel-so you can send them out to compete confident today and protect who they're becoming tomorrow.

FAQ

Smart Training Will Change Your Game, Fast
  • Attack Briefs are made from 100% GOTS-Certified Organic Merino Wool — sourced from real sheep 🐑. Unlike synthetic performance underwear that relies on plastic-based fabrics treated with chemicals, our merino wool is a natural, renewable fiber that works with your child's body rather than against it. The wool comes from ethically raised sheep and is processed without the use of toxic chemicals, synthetic pesticides, or harmful dyes.

  • GOTS stands for Global Organic Textile Standard — the worldwide leading textile processing standard for organic fibers. GOTS certification means:

    • The wool is 100% organic and traceable from farm to finished product
    • No synthetic pesticides, herbicides, or GMOs were used in production
    • Processing uses only low-impact, non-toxic dyes and chemicals
    • Strict environmental and social criteria are met throughout manufacturing
    • Independent third-party verification at every stage

    GOTS is the gold standard for organic certification — it's the highest level of assurance that what touches your child's skin is genuinely clean and safe.

  • Attack Briefs carry multiple certifications for your peace of mind:

    • GOTS-Certified Organic Merino Wool Partners — Global gold standard for organic textiles
    • Independent Lab-Certified — Tested and verified FREE from plastic, BPA, PFAS, phthalates, and toxic dyes

    We don't just claim to be clean — we prove it with third-party verification.

  • Merino wool is nature’s original performance fabric, and it simply does more than cotton or polyester. Its ultra-fine fibers actively regulate temperature—keeping you warm when it’s cold and cool when it’s hot—while efficiently wicking moisture away from the skin and releasing it into the air. Unlike cotton, which absorbs sweat and stays wet, or polyester, which traps heat and odor, merino stays dry, breathable, and comfortable during movement.

    What really sets merino apart is that it delivers high performance without plastic or toxic chemicals. It’s naturally antimicrobial, so it resists odor even after repeated wear, and its soft 18.5-micron fibers reduce friction and chafing. While polyester relies on chemical treatments and sheds microplastics, merino wool is a renewable, biodegradable fiber that does everything synthetics promise—only cleaner, safer, and better for your body.

  • No! Many people hear "wool" and think of scratchy sweaters from grandma's closet. Attack Briefs use superfine 18.5 micron merino fibers — these are incredibly thin, soft, and smooth. For reference:

    • Human hair: ~70-100 microns
    • Regular wool: ~30-40 microns
    • Our merino: ~18.5 microns

    The finer the fiber, the more it bends with your skin rather than poking it. Our merino feels silky smooth against the skin — softer than most cotton underwear. Kids who have worn Attack Briefs consistently say they're the most comfortable underwear they've ever had.

  • Actually, the exact opposite is true. This is one of the biggest misconceptions about merino wool.

    Merino wool is thermoregulating — meaning it naturally adapts to your body's temperature:

    • When it's hot: Merino fibers release heat and wick moisture away from the skin, keeping your child cooler
    • When it's cold: The same fibers trap warmth to provide insulation

    This is why merino is the fabric of choice for elite athletes, from marathon runners to alpine skiers. It keeps you comfortable across a wide range of temperatures — exactly what young athletes need during intense practices and games in varying weather conditions.

  • To find the perfect size:

    1. Use a flexible measuring tape
    2. Measure around the natural waistline (typically the narrowest part of the torso, just above the belly button)
    3. Keep the tape snug but not tight
    4. Match the measurement to our size chart

    Pro tip: If your child is between sizes, we recommend sizing up for a more comfortable, athletic fit that allows freedom of movement during sports.

  • While every child is different, here are general age guidelines:

    • YS (Youth Small): Typically fits ages 5-7
    • YM (Youth Medium): Typically fits ages 8-10
    • XS (Extra Small): Typically fits ages 11-13
    • Small: Typically fits ages 14+ / Young adults

    Important: Always measure waist size rather than relying solely on age — kids grow at different rates!

  • Attack Briefs are designed to fit true to our size chart. However, because we use 100% natural merino wool with no synthetic elastane or spandex, here are a few things to note:

    • The fit is athletic and supportive but not overly compressive
    • Natural fibers have a slight give that conforms to the body
    • Minimal shrinkage may occur with washing (typically less than 3-5%)

    Our recommendation: If you're between sizes or prefer a looser fit, size up. You can always shrink them slightly with a warm wash if needed.

  • Attack Briefs are athletic boxer briefs — they provide a snug, supportive fit without the extreme compression of compression shorts. Think of them as:

    • More fitted than traditional boxers
    • Less restrictive than full compression wear
    • Perfect balance of support and freedom of movement

    This makes them ideal as everyday underwear AND sports performance wear.

  • Standard polyester underwear contains a cocktail of chemicals that can be absorbed through your child's skin:

    What's in conventional underwear:

    • Polyester & elastane (plastic-based synthetic fabrics)
    • BPA, PFAS, and phthalates (endocrine-disrupting chemicals)
    • Toxic dyes, bleaches, and inks
    • Formaldehyde (wrinkle-resistance treatment)
    • Synthetic pesticides and herbicides

    Why this matters for athletes: When your child exercises, three things happen that accelerate chemical absorption:

    1. Heat — Body temperature rises, causing synthetic fabrics to release more chemicals
    2. Sweat — Moisture opens pores and increases skin absorption
    3. Friction — Movement rubs chemicals into the skin

    The groin area is one of the most absorbent areas of the body AND the most sensitive for hormone development. Prolonged exposure to these chemicals during sports — when absorption is at its peak — is exactly what we're designed to prevent.

  • Yes! Attack Briefs are naturally hypoallergenic because:

    • 100% organic merino wool — No synthetic fibers that can irritate sensitive skin
    • No toxic dyes — We use only OEKO-TEX® certified, non-toxic dyes
    • No chemical treatments — No formaldehyde, no anti-wrinkle chemicals, no pesticide residues
    • Natural antimicrobial properties — Merino wool naturally resists bacteria that can cause skin irritation

    Many parents of children with eczema, contact dermatitis, or general skin sensitivity report significant improvement after switching to Attack Briefs.

  • Absolutely! While our marketing focuses on the hormone health concerns most associated with male development, the chemical safety benefits apply to ALL young athletes. The athletic boxer brief cut works well for girls in sports like:

    • Soccer
    • Basketball
    • Softball
    • Gymnastics
    • Track & Field
    • Swimming (under suits/warm-ups)

    The same toxic chemicals that affect hormone development in boys also affect girls. Clean, chemical-free underwear benefits everyone.

  • Attack Briefs are designed for all sports and athletic activities, including:

    ⚾ Baseball & Softball 🏀 Basketball
    🏈 Football ⚽ Soccer 🏒 Hockey 🤼 Wrestling 🏊 Swimming (under suits) 🎾 Tennis 🏃 Track & Field / Cross Country 🥍 Lacrosse 🤸 Gymnastics ⛳ Golf 🎿 Skiing & Snowboarding 🚴 Cycling

    Whether it's a hot summer tournament or cold winter practice, the thermoregulating properties of merino wool keep your athlete comfortable.

  • Recommended care:

    • Machine wash on cold with gentle/delicate cycle
    • Use a mild detergent (preferably wool-safe or eco-friendly)
    • Tumble dry on low heat or lay flat to dry

    Do NOT:

    • Use bleach
    • Use fabric softener (coats fibers and reduces performance)
    • Wash with rough fabrics (jeans, zippers, Velcro)
    • Use high heat drying
  • One of the benefits of merino wool is that it doesn't need to be washed after every wear. The natural antimicrobial properties mean:

    • Light activity / everyday wear: Can be worn 2-3 times before washing
    • Heavy sports activity: Wash after use, or air out overnight and wear again during tournaments
    • Between washes: Simply air out in a well-ventilated area

    Less washing = longer garment life = better value.

    • US orders: Typically arrive within 4-14 business days

    Orders ship next business day while supplies last.

  • Let's be real — Attack Briefs are a premium product, and here's why:

    What you're paying for:

    • 100% GOTS-Certified Organic Merino Wool (expensive to source)
    • Independent lab testing and certification
    • Superior performance that outperforms synthetic fabrics
    • No chemical shortcuts in manufacturing

    What you're NOT paying for:

    • Cheap plastic fabrics made from petroleum waste
    • Mass production with no quality control
    • Marketing budgets of billion-dollar underwear conglomerates

    The real comparison: A pack of synthetic underwear might cost $15-20, but:

    • Those briefs contain chemicals linked to hormone disruption
    • They need replacing every few months as they lose shape
    • The hidden health costs are impossible to calculate

    Attack Briefs are an investment in your child's health, comfort, and performance. When you factor in durability and what you're protecting, they're actually excellent value.

  • Many brands market themselves as "natural" or "organic" — but the details matter:

    What to watch out for:

    • "Organic cotton" underwear that's actually 95% cotton + 5% elastane (still has synthetic)
    • Products without third-party certification (just claims, no proof)
    • Brands that don't disclose their full material and chemical testing
    • "Natural" products with toxic dyes or chemical treatments

    What makes Attack Briefs different:

    • 100% organic merino wool — No synthetic blends, no elastane, no spandex
    • Triple certification — GOTS partners and independent lab testing
    • Designed specifically for youth athletes — Not repurposed adult underwear
    • Full transparency — We tell you exactly what's in our product and what's not
  • We've compiled just a fraction of the research and references throughout this FAQ. For deeper reading:

    • Endocrine disruptors in plastics: https://www.endocrine.org/topics/edc/plastics-edcs-and-health
    • PFAS and cancer risk: https://dceg.cancer.gov/research/what-we-study/pfas
    • Polyester and fertility: https://pubmed.ncbi.nlm.nih.gov/8279095/

    Testosterone decline: https://pmc.ncbi.nlm.nih.gov/articles/PMC8530230/