This Martial Arts Uniform is made of cotton for less wrinkle and minimum shrinkage. Pants are equipped with Elastic and Drawstring Waist. Thanks to its strong cotton construction, this durable uniform is ready to go the distance.The higher the weight, the higher the quality. The heavy weight uniform consists of a 14oz (100% cotton), the middle weight is 10oz (45% Poly & 55% Cotton), the light weight is 8oz (45% Poly & 55% Cotton).