Material:. Cup / Crotch: 100% Pure Silk. Body Fabric: Silk-Cotton Blend (78% Organic Pima Cotton, 22% Silk). Details. Luxuriously crafted in breathable Pima Cotton and lined in silk, this sumptuously soft bra is designed to give an exquisite fit and incredible comfort. Front fastening plastic buckles for sport, leisure, and post-operative wear and also suitable for sleeping in. Non-metallic buttons for easy on and off. Non-wired full cup bra shape for maximum wireless support