... % bamboo, 20% acrylic, 5% spandex Cool, breathable, durable, anti-bacteria, feel cool in summer Men bamboo fiber brief: 75 ... acrylic and 5% spandex.Bamboo fibre has the feature of anti-bacteria, breathable, durable, deodorization good colour stickness, absorbent etc ... absorb sweat(Three time to cotton) 3 deodorization4 Anti-bacteria5 Environmental protection and UV cut6 Natural and healthy to body7 ...