Moku™ SpermShield Pro

Moku™ SpermShield Pro

 Excelent 1,717+ Reviews
€37,95
€37,95 €77,95
SAVE 51% Sold out

arrow_upward_alt 62% Testosterone after Icing

check_circle Maintains Optimal Sperm Count

award_star Bryan Johnson's Exact Protocol

account_box Men Say This Fits True to Size based on 212 Reviews

  • American Express
  • Apple Pay
  • Discover
  • Klarna
  • Mastercard
  • PayPal
  • Visa
100+ orders
in the last 24h
  • heart_plus Love Them Guarantee
  • support_agent 24/7 Live support
  • local_shipping Free US Shipping
Moku™ SpermShield Pro

Moku™ SpermShield Pro

 (717 Reviews)
€37,95
€37,95 €77,95
SAVE 51% Sold out

Description

High-heat sauna sessions tank sperm count and testosterone: up to 50% drop per session. Spermshield cooling underwear protects your biomarkers during the Bryan Johnson protocol.

  • 100% cotton with BPA-free, PFAS-free gel packs
  • Maintains optimal 2-3°C testicular cooling for 3+ hours
  • External pocket = discreet, no bulk, sauna-engineered
  • Reusable forever; machine washable
  • Built specifically for 200°F+ heat exposure

Clean materials. Precision cooling. Full fertility protection.

measuring_tape

What's My Size?

Moku fits True To Size. Unsure? Size down to be safe

S: Waist 28–31' / US-UK 28–30 / EU 44–46
M: Waist 31–33' / US-UK 31–32 / EU 46–48
L: Waist 33–36' / US-UK 33–35 / EU 48–50
XL: Waist 36–40' / US-UK 36–39 / EU 50–52
XXL: Waist 40–44' / US-UK 40–43 / EU 54–56

shield_lock

Love Them Guarantee

We want you to be 100% confident in your purchase. We offer a 30 day quality guarantee. If you're not satisfied - no worries! Just contact us and we'll make it right.

- we've got you covered!

local_shipping

Shipping & Delivery

We offer worldwide secured shipping. Orders are processed in 24-48 Hours. Delivery typically takes 3–8 business days.

Jump to..

verified Reviews help FAQ loyalty Benefits conditions Wear
View full details

The Most Impactful Health Investment

  • Validated by Johnson's Protocol

    Bryan Johnson's results: 57% fertility improvement using ball icing and a 62% jump in Testosterone. Spermshield was engineered specifically for this exact protocol.

  • Zero Friction Integration

    Pop it in the freezer, Insert it, Forget it exists. The contoured design locks into position and disappears so you can focus on your protocol and detox without covering yourself in PFAS.

  • Precision Temperature Control

    Maintains the exact 2-3°C cooling your testicles need to thrive without damaging them. No guesswork. No damage. Just optimal hormone production while you access every sauna benefit without sacrifice.

    The Most Impactful Part of Your Routine

    Clinical studies show icing improves testosterone levels, sperm count, and biomarkers - especially when paired with sauna

     

    Precision 2-3°C Cooling

    Engineered to keep your balls at the optimal temperature: No warmer or colder

     

    Sauna Safe

    Tested in 200°F+ Heat to hold up for 3+ Hours in the Sauna

     

    Toxin Free

    100% cotton, BPA and Toxin Free

    Love Them Guarantee

    We’re so confident in the quality and fit of our underwear, you get 30 days to try them. Not satisfied? We’ll make it right.

    menstrual_health
    Protects Fertility & Testosterone

    Icing has shown the 57% improvement in sperm count and a 62% jump in testosterone levels.

    mode_heat_cool
    Sauna Gains Without Trade-Offs

    Access the full cardiovascular and detox benefits of the sauna, while maintaining optimal hormonal health.

    approval_delegation
    Bryan Johnson's Proven Protocol

    The exact ice-cooling method that delivered his 57% fertility improvement during daily sauna use and his #1 recommended routine.

    Our Reviews

    Excellent 4.85 / 5
    (1,717+ Reviews)

    • would recommend

      I don't have a sauna and my gym's one is always packed, but i looked into the benefits of just cooling on itself and they're outstanding. I feel much more invigorated and my libido has jumped as well. I would say it's a good purchase and probably top 3 basic routines.

      André K.

    • Honestly thought this would be gimmicky but I'm a data guy so I tested it. Got my sperm analysis done before starting sauna protocol, then again after 8 weeks of using Spermshield. Motility up 31%, count up 22%, and I literally forget I'm wearing it. way more comfortable than the frozen peas method I tried before lol. If you're doing sauna regularly, this is non-negotiable

      Tom K.

    • Worthwhile investment

      great quality material, great build, good cooling. It doesn't freeze your balls but keeps them at a steady cool temp. Thanks!

      Patrick S.

    • Tried Bryan Johnson's ice-pack-in-boxers thing for like 2 weeks and it was a pain in the ass. Ice melting everywhere, constantly adjusting, felt ridiculous. The Spermshield just works. Freeze it, put it on, done. Lasts my whole session plus some. Already paid for itself in time saved and honestly peace of mind knowing I'm not tanking my T while I'm trying to optimize everything else.

      William A.

    • Was worried this would be obvious or bulky but you literally can't tell I'm wearing it. External pocket design is genius. And the 3-hour thing isn't marketing BS. I do 20 min sauna sessions and the pack is still cold after. My gym has a sauna and nobody has any idea. If you're self-conscious about it, don't be. Total game changer for anyone serious about heat therapy.

      Elias G.

    • Worth It From Day One

      Stupidly simple and crazy effective. My biomarkers stayed solid through 4 months of daily sauna. Can't recommend enough.

      Daniel M.

    • Not trying to have kids anytime soon but my doc told me low sperm count often means low T and other hormone issues. Did sauna 5x/week for 2 months unprotected and my energy crashed, libido tanked. Bloodwork showed testosterone dropped 18%. Started using Spermshield and it's been 3 months: T is back up, feel like myself again. This isn't just about fertility, it's about not screwing up your entire hormone system.

      David P.

    • Actually Feels Different

      If you're optimizing everything else but skipping this, you're leaving gains on the table. Seriously worth it.

      Lukas W.

    • Tried Snowballs first and it was way too cold, like painfully cold for the first few minutes. Plus those packs don't even last 30 min so I had to swap mid-session which defeated the whole point. Spermshield lasts almost 3 hours which means I'm covered for my whole routine. Actually feels like it was designed by someone who uses saunas, not just repurposed thrown together bs.

      Micheal R.

    • Great purchase

      Best biohacking purchase I've made this year. Simple, effective, actually works. My sauna routine is finally complete

      Arther T.

    • Game changer. No more guessing if I'm protecting myself. Just freeze and go. Wish I'd found this sooner.

      Mark W.

      Frequently Asked Questions

      FAQ

      straighten

      What Size am I?

      Our sizing runs true. Based off of 212+ Reviews going with your regular size, or when unsure, sizing down has always been the best option. There's no going wrong!

      local_shipping

      How fast is shipping

      Processing takes 24-48 hrs. Once your insured order is shipped with tracking, it will arrive in 3-8 days.

      redo

      What if I don't like them?

      Totally fair. That’s why we offer a Love Them Guarantee. If you don’t love our pairs, we’ll refund you. Simple as that.

      help

      Why can't I just use an ice pack

      Generic ice packs shift, melt, and cool inconsistently. Plus most contain BPAs and PFAs—toxins you don't want near your skin during heat exposure. CryoVault is contoured to stay in place, BPA/PFAS-free, and maintains optimal 2-3°C cooling for 3+ hours.

      help

      How does the cooling work?

      Freeze the medical-grade gel pack for 2-3 hours, insert it into the external pocket, and wear during your sauna session. The gel maintains optimal testicular temperature at 2-3°C below core body temp for 3+ hours—preventing heat damage while you access full sauna benefits.

      help

      Is icing only for the sauna?

      No. Use Spermshield during any activity that raises testicular temperature or simply for ice therapy: hot yoga, long drives, hot tubs, sitting for extended periods, intense workouts, or hot weather. It's optimized for sauna but works anywhere heat is a concern or even when it isn't - it's shown to be beneficial even at body temprature.

      help

      Is the cool pack noticeable

      No. The external pocket design means no bulge or visible outline. It looks and feels like regular underwear from the outside. Total discretion—nobody will know you're wearing it.

      help

      What does icing do?

      Protects sperm and testosterone from heat damage during sauna (prevents 50%+ fertility and testosterone drops). Also beneficial as standalone cold therapy, testicular cooling has been shown to improve sperm quality and hormonal health even without heat exposure.

      help

      What if I don't want a kid?

      This isn't just about fertility. Low sperm markers indicate hormonal dysfunction, reduced testosterone, poor energy, decreased libido, and slower recovery. Heat damage affects your entire endocrine system. Plus recovery takes 3-6 months. Protect now, stay optimized.

      help

      I don't have a sauna

      SpermShield works for any heat exposure: gym saunas, hot yoga studios, hot tubs, spa visits, or even just hot weather/long drives. Also effective as standalone cold therapy. Testicular cooling improves sperm quality and testosterone even without sauna.

      • shield_lock

        Love Them

        MONEY BACK GUARANTEE

      • box_edit

        Free Returns

        NO QUESTIONS ASKED 

      • support_agent

        24/7

        CUSTOMER SERVICE

      • local_shipping

        Free Shipping

        SAME WEEK

      • security

        Toxin Free

        DURABLE BUILD

        Research Shows SpermShields Real Impact:

        See why 20,000+ men have switched to SpermShield™ and never looked back.

        100%

        Cotton, BPA-free, PFAS-free—clean materials only

        57%

        Bryan Johnson's fertility improvement using ice during sauna

        62%

        Increase in testosterone after one week of 30 minute icing sessions

        The above information was gathered through clinical studies and Results from the Bryan Johnson protocol.

        The Moku Advantage

        Moku is a brand built by engineers tasked with making a easy solution to your sauna dilema and creating an impactful part of your daily routine.

          Others
        2+ Hrs Cooling Duration
        Discreet External Design
        10+ Year Durability

        Why Choose us

        • local_shipping

          Free Shipping

        • shield_with_heart

          100% Satisfaction Guarantee

        • check_circle

          24/7 Customer Support

        • encrypted

          Secure Payments