The Crisis No One Talks About, Until It Affects You

Stop Sperm Decline With Underwear Today
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Oeko-Tex® Certified

Free from harmful chemicals and safe for sensitive skin

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Scientifically Backed Design

Crafted to minimize heat and maximize breathability

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Expert-Inspired Fabric

Inspired by insights from fertility research and expert recommendations

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Fertility-Focused Mission

Our Commitment to You

The Underwear Designed to Protect Your Future Together

With fertility decline accelerating, we created underwear that doesn’t just protect skin, it protects your ability to grow a family.

Made from Bamboo Lyocell, our underwear is breathable, hypoallergenic, and free from hormone-disrupting toxins - designed to reduce heat and improve circulation where it matters most.

Through a closed-loop process, we ensure zero harmful residues and maximum comfort - supporting reproductive health for those trying to conceive or protect hormonal balance.

Supports Your Fertility Goal Now

Why Couples Are Making the Switch

Front view of black bamboo Lyocell men’s underwear by Mr. Fertyl, showcasing a breathable, fertility-safe design.
Thermometer icon symbolizing body temperature regulation through breathable, heat-regulating bamboo Lyocell fabric.
Heat Regulation

Protects Fertility By Keeping You Cool

Excessive heat is a leading cause of reduced sperm count and motility. Our ultra-breathable Bamboo Lyocell helps regulate temperature, creating a cooler environment that supports reproductive health for couples trying to conceive.

Protects Fertility By Keeping You Cool

Excessive heat is a leading cause of reduced sperm count and motility. Our ultra-breathable Bamboo Lyocell helps regulate temperature, creating a cooler environment that supports reproductive health for couples trying to conceive.

Toxin Free

Prevents Hormonal Disruption

Hormone-disrupting chemicals (EDCs) interferes with fertility and sperm quality. Our fabric is free of pesticides, formaldehyde, and other toxins, helping couples avoid hidden threats to hormone health and conception.

Prevents Hormonal Disruption

Hormone-disrupting chemicals (EDCs) interferes with fertility and sperm quality. Our fabric is free of pesticides, formaldehyde, and other toxins, helping couples avoid hidden threats to hormone health and conception.

Bold black 'no' symbol indicating our underwear is free from harmful chemicals and toxins linked to reproductive harm.
No Microplastics

Protects Reproductive Health At The Molecular Level

Microplastics can leach harmful chemicals into the body, impacting hormones and fertility. Our fabric is 100% microplastic-free, shielding the most sensitive areas from invisible toxins that can harm your changes of conceiving

Protects Reproductive Health At The Molecular Level

Microplastics can leach harmful chemicals into the body, impacting hormones and fertility. Our fabric is 100% microplastic-free, shielding the most sensitive areas from invisible toxins that can harm your changes of conceiving

Blood drop icon symbolizing hormone health, circulation, and toxin-free underwear supporting male fertility.
Moisture Wicking

Prevents Fertility-Impacting Bacteria

Moisture buildup fuels bacterial growth that disrupts reproductive health. Our fabric wicks away sweat 4x faster than cotton - keeping you dry, clean, and in a fertility-supportive environment.

Prevents Fertility-Impacting Bacteria

Moisture buildup fuels bacterial growth that disrupts reproductive health. Our fabric wicks away sweat 4x faster than cotton - keeping you dry, clean, and in a fertility-supportive environment.

Symbol representing fertility-safe underwear made with protective, non-toxic materials.
Antimicrobial

Maintains A Fertility-Friendly Balance

Bacterial overgrowth upsets the balance needed for reproductive wellness. Our fabric resists odor-causing bacteria naturally - supporting a cleaner, healthier foundation for fertility.

Maintains A Fertility-Friendly Balance

Bacterial overgrowth upsets the balance needed for reproductive wellness. Our fabric resists odor-causing bacteria naturally - supporting a cleaner, healthier foundation for fertility.

Minimalist leaf icon representing eco-friendly, plant-based bamboo Lyocell used in Mr. Fertyl underwear.
Hypoallergenic

Gentle On Sensitive Skin

Inflammation and irritation interferes with overall hormonal and reproductive health. Our hypoallergenic fabric reduces friction and sensitivity, creating a calm, skin-safe environment that benefits fertility.

Gentle On Sensitive Skin

Inflammation and irritation interferes with overall hormonal and reproductive health. Our hypoallergenic fabric reduces friction and sensitivity, creating a calm, skin-safe environment that benefits fertility.

Icon represents breathability & airflow-highlighting the cooling comfort of bamboo Lyocell fabric to support male fertility.
Breathable

Promotes Circulation Where It Matters

Healthy airflow supports hormone balance and optimal sperm production. Our breathable design reduces overheating and irritation - ensuring comfort that contributes to your reproductive goals.

Promotes Circulation Where It Matters

Healthy airflow supports hormone balance and optimal sperm production. Our breathable design reduces overheating and irritation - ensuring comfort that contributes to your reproductive goals.

Still Have Questions? Check Out Our FAQ

Stop Guessing. Start Protecting. See What 300+ Are Saying.

"Seriously, Once You Try These, You Won't Go Back."

"Consider This Your Sign To Upgrade. You'll Feel The Difference."

"I'm Literally Throwing Out His Old Ones Because These Are Just Better."

"Never Going Back To The Cheap Stuff."

Shop Clean, Fertility-Safe Underwear Now

Fertility Experts Agree: Your Underwear Matters

"PFAS can disrupt our reproductive hormones and have been linked with delayed puberty onset and increased risks for endometriosis and polycystic ovary syndrome."

Dr. Damaskini Valvi, MD, PhD, MPH

Assistant Professor of Environmental Medicine and Public Health at Mount Sinai and Nationally Recognized PFAS Expert

"These days, polyester is a commonly used synthetic material for underwear. It has been shown to hold in heat and is less breathable than other materials. The testicular temperature may rise due to such material, leading to scrotal heat stress."

Dr. Akta Bajaj, MBBS, MD 

Senior Consultant & Head of Obstetrics & Gynecology at Ujala Cygnus Group of Hospitals

"Polyester is basically plastic and can break down into microplastics, which can release a lot of chemicals that can be absorbed effectively from the scrotal skin."

Dr. Arunima Haldar, MD, MBBS

IVF & Reproductive Medicine Specialist

"Men occupationally exposed to BPA have shown decreased sperm quality, reduced libido and higher rates of erectile dysfunction."

Dr. Shanna Swan, PhD

Award-Winning Scientist Based at Mt. Sinai (New York, NY)

"If men wear tight underwear, the temperature around the testicles is increased, and that can have detrimental effects on the quality and the number of sperm."

Dr. Alex Polyakov, MBBS

Clinical Director of Melbourne IVF and Senior Lecturer at University of Melbourne

"Any exposure [to heat] that significantly increases temperature is likely to affect spermatogenesis (sperm production)…"

Dr. Jorge Chavarro, MD, ScD

Associate Professor of Nutrition and Epidemiology at Harvard T.H. Chan School of Public Health

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Protect More Than Comfort - Protect Your Future

When you choose Mr. Fertyl, you’re protecting more than just comfort - you’re protecting your future together.

Our underwear creates the ideal environment for reproductive wellness, combining unmatched softness with toxin-free materials that support hormonal and fertility health.

Feel confident knowing you're taking control-together.

Protect Your Family’s Future Now