Rated 4.7 · 843 men trust ThermoCore
ThermoCore™ Cooling Briefs 100% Cotton
ThermoCore™ Cooling Briefs 100% Cotton
Regular price
$49.99
Regular price
$49.99
Sale price
$70.00
Unit price
per
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ThermoCore™ Cooling Briefs 100% Cotton
Regular price
$49.99
Regular price
$49.99
Sale price
$70.00
Unit price
per
The Research
Why heat and fertility are linked
THE FERTILITY WINDOW
WHAT A SAUNA DOES
THE THERMOCORE BARRIER
Why the Sauna Is Silently Hurting Your Fertility
Left: Healthy sperm at optimal temperature. Right: Sperm after regular sauna exposure.
Targeted Fertility Cooling
Keeps scrotal temperature in the optimal zone — the 2–4°C differential linked to healthy sperm count and motility.
Built to Last
durable enough to wash and reuse indefinitely without losing shape or cooling performance.
Targeted Fertility Cooling
Keeps scrotal temperature in the optimal zone — the 2–4°C differential linked to healthy sperm count and motility.
Built to Last
durable enough to wash and reuse indefinitely without losing shape or cooling performance.
100% Premium Cotton
Unlike synthetics that trap heat, cotton breathes naturally — cooler against the skin and gentler for daily wear.
Reusable Cooling Insert
Freeze, use, refreeze. Stays cold for a full 25–30 minute session and slots discreetly into a zippered pocket.
100% Premium Cotton
Unlike synthetics that trap heat, cotton breathes naturally — cooler against the skin and gentler for daily wear.
Reusable Cooling Insert
Freeze, use, refreeze. Stays cold for a full 25–30 minute session and slots discreetly into a zippered pocket.
Simple to use
How it works
1
Freeze the insert
Place your reusable cooling insert in the freezer before your session. It takes about 2 hours to reach optimal temperature.
2
Insert and wear
Slide the insert into the discreet cooling pocket. No one will know it's there. 100% cotton feels like premium athletic wear.
3
Sauna as normal
Enjoy your full session knowing your temperature is protected. For sessions over 30 minutes, rotate with a second insert.
Testimonials
Before You Step Into The Heat
Answers to the most common questions about ThermoCore™.
How does sauna affect my fertility?
Healthy sperm production requires a scrotal temperature 2–4°C below core body temperature. A typical sauna session raises scrotal temperature by 2–3°C — enough to push outside the optimal range. Sustained heat exposure over weeks can measurably reduce sperm count and motility.
Is the cooling insert reusable?
Absolutely. Simply place the insert in the freezer before use, then reuse it again and again for future sessions.
How long does the cooling last?
Cooling duration varies based on sauna temperature, session length, and individual body heat, but most users experience cooling support throughout a typical sauna session roughly 25-30 minutes. For longer sessions, additional inserts can be rotated as needed.
What materials are the briefs made of?
100% cotton body with a cotton/spandex waistband for a secure, comfortable fit. Cotton is deliberately chosen over synthetics — it breathes naturally and stays cooler against the skin.
Is it machine washable?
Remove the cooling insert first, then machine wash cold on a gentle cycle. Tumble dry low or air dry to preserve the cotton and extend the life of the brief.
How do I keep the cool packs cold if I go to work/gym before using them?
Pack them in a small insulated lunch bag or cooler with an ice pack. They hold their temperature well for several hours when insulated.
