The American Apparel Unisex Baby Rib Brief is made with 5.8oz 100% Baby Rib cotton (Heather Grey contains 10% Polyester). It features an elastic waistband, elastic trim, matching front panel and a front opening. Superior screen printing results! Fluorescent colors - machine wash separately! Stain removers cannot be used on Fluorescent colors. Shrinkage: will shrink an average of one size when put in the dryer!