Here is a super soft and comfortable bamboo base layer with blue seams that works perfectly as a first layer next to the skin. Bamboo is an absolutely fantastic material that absorbs sweat quickly and breathes well. It is also a really smart material that has a cooling effect when it's warm and a warming effect when it's cold. We at SMILE love this model, and no matter how many we usually buy, they always sell out far too quickly. Order this soft bamboo base layer today, and we'll keep our fingers crossed that you find it as soft, comfortable, and functional as we do!