Why bamboo clothing feels cool in summer and warm in winter

Short answer: Because the effect depends on whether you sweat. If you sweat, evaporation cools. If you do not, the fabric insulates like any other fabric of the same weight.

In summer

The moisture is moved from the skin out into the air, and the evaporation takes heat with it. That feels like coolness. See advantages of bamboo viscose.

In winter

Without sweat no evaporation happens. Then the fabric insulates exactly like other fabrics of the same weight. See facts about bamboo.

That is why it works both ways

The material does not do two different things. It does the same thing, and the result depends on the circumstances. See bamboo underwear for men.

As a layer in winter

A thin layer that keeps the skin dry is precisely what stops you getting cold after sweating. See bamboo underwear for women.

Fabric softener cancels both

A film on the fibre removes both the summer and the winter effect. See washing and care.

Frequently asked questions

Why is bamboo cool in summer?

Because the moisture is moved away from the skin, and evaporation takes heat with it.

Why is it not cold in winter?

Because no evaporation happens when you do not sweat. Then it insulates like any other fabric.

Does the material do two different things?

No. It does the same thing, and the result depends on whether you sweat.