Women’s bamboo rayon long sleeve thermal vest. This unique fabric offers a very warm, extremely comfortable blend of 68% Rayon made from Bamboo / 23% Cotton / 4% Spandex. Bamboo is naturally antimicrobial, hypo-allergenic and moisture wicking. It is smooth and very soft to the touch. Bamboo fabrics maintain these qualities after many washes. Bamboo is naturally regenerative.