Material. Cup / Crotch: 100% Pure Silk. Body Fabric: Silk-Cotton Blend (78% Organic Pima Cotton, 22% Silk). Details. Highly breathable silk and Pima cotton, hypoallergenic and soft. Non-slip and wide shoulder strap. Cover in cotton to prevent irritation, no exposed rubber band. Safe to wear, no phosphor bleach on fabric. Non-padded