Why freeze if you can be warm? The secret to this base layer set Reima Moomin Trivsam is a double-sided knit: silky soft bamboo viscose against the skin to absorb moisture and give a soft feel, and wool on the surface, for the best possible warmth in the base layer. The bamboo viscose absorbs moisture from the skin and helps kids feel cool. The wool keeps kids warm, even if they sweat after intense play. This suit is ideal for thermal comfort, both indoors and outdoors.