Material:. Cup / Crotch: 100% Pure Silk. Body Fabric: Silk-Cotton Blend (78% Organic Pima Cotton, 22% Silk). Features:. This bra is designed to improve posture while keeping your bust secure and comfortable. Back Support cross-compression for posture correction. X” shaped straps that pull your shoulder back and align your body posture to relieve back and shoulder pain. Light, breathable Pima Cotton for a truly fresh feel. Soft side cup support & Wire Free. Half-adjustable straps for support. Non padded