1,200,000+ items sold
Black Friday Deals
The TENCEL™ basics trusted by 100,000+ men. Now with exclusive Black Friday savings. Your moment to upgrade.
2+1 Free - Undershirts
4+2 Free - Active Boxer Briefs
2+1 Free - Classic T-shirts
4+2 Free - Regular Briefs
4+2 Free - Regular Socks
NEW
Classic T-shirt
Fitted across the chest and shoulders. Comfortable around the midsection. The ultimate everyday T-shirt.
Made with TENCEL™
Everyday comfort, made better.
Breathable & Temperature-Regulating
Releases heat and moisture to keep you comfortable.
2× more breathable than cottonMoisture-Wicking
Wicks away moisture and dries faster than cotton.
50% more moisture absorptionSilky Soft on Skin
Longer fibres, less friction. Hypoallergenic.
Less chance of irritationKeeps Its Shape
Retains its shape and colour, wash after wash.
100+ washes without losing shapetheir socks are very good quality. they are my favorite ones to wear. the nickers are also of good quality. already bought a second set of both.
W VerwijsThe quality is amazing, feels extremely soft and very absorbant
iliasBest underwear I have ever owned and it's been about two weeks now and the verdict stays the same. Quality is unmatched.
Rodger SchirmerThe underwear is superb quality. Comfortable wearing.
WimBefore I knew, customer service notified me that I've order a small size.
D.P . LobatoShe also asked if they could still help me with a nice gift and helped me within 2 days.
Roger Tjon Kie SimAfter that they send me a new item of the old version and they fit perfect
Bram Van De GevelQuick communication on slight delay in delivery
Tom GambrahDidn't believe it but tried it anyway. And man i was wrong. Even with running they stay in place!
jorisThe boxers are feeling great, i have the feeling that i don't wear any at all. Also great for wearing them to the gym.
klantthe first boxershorts he can wear all day long without having any irritation by the end of the day. He works 12-14 hours a day
MaudI was amazed that you barely can feel the underwear. No more sweating. Proud to say I bought 6 more
Devano WeberMore than enough stretch. Fits perfect. Dries quickly.
Luc BogaertsGreat price for the quality of the fabric.
RickGreat fit even greater fabrics, feels so good, for a very reasonable price!
FranciscoFantastic product, especially at the price. Bought 3 initially to test, will be going back for more.
Andy DFast delivery, good price, and good quality.
RobinNo reviews in this category yet.
Your order does more than just arriveYour purchase has more impact than you think
This is what KHAIZEN Underwear customers have achieved since 2024.
1,118.072 tonnes
Of CO₂ offset
4.201 million
Miles of driving in an average car offset
28
Months Earth Positive, without interruption
Tag us, get a free pair
Share yourself in #KHAIZEN and receive a gift card.
-
Show off your KHAIZEN and take a photo or video.
-
Post and tag @khaizen_underwear, then email us your photo or video.
-
We’ll send you a gift card for a free pair.





