Long Underwear for Men – Bamboo Long Johns

Short answer: Long underwear for men – long johns – is the thin, warm layer under your trousers when the temperature drops. In bamboo viscose they keep you warm without turning clammy, because the material moves sweat away from the skin.

What are long johns?

Long johns are underwear with legs all the way down to the ankle. They are worn under your ordinary trousers and work as an insulating layer on cold days — for outdoor work, winter walks or simply a cold day at the office. See the range of bamboo long johns.

Why bamboo rather than wool and cotton

Cotton turns damp and cold when you sweat, and wool can scratch against bare skin. Bamboo viscose is as soft as the best cotton, but moves the moisture away, so you stay dry and warm. Read how the material regulates temperature in our post on bamboo and temperature regulation.

Build the whole base layer

Long johns do their best work together with a long-sleeved undershirt, so the whole body has the same thin, warm layer. See bamboo undershirts for men, and read our guide to bamboo as a base layer in winter.

Frequently asked questions

When should you wear long johns?

When you spend a long time in the cold — outdoor work, winter walks or cold days in general. They are worn as a thin layer under your ordinary trousers.

Are bamboo long johns warm enough?

Yes, for most purposes. They insulate well for how thin the fabric is, and because they keep the skin dry, they feel warmer than damp cotton.

Can long johns be felt under your trousers?

Almost not at all. Bamboo viscose is thin and smooth, so long johns slip in under ordinary trousers without squeezing or bunching.