Materials. Cup / Crotch: 100% Pure Silk. Body Fabric: Silk-Cotton Blend (78% Organic Pima Cotton, 22% Silk). Details. Cut from Pima Cotton and lined in silk, this bra promises maximum comfort and support. Shaped three-part cups ensure a natural fit and feel wonderfully soft on the skin. Side sling for additional support and forward projection. Smoothing coverage under arms & back and wide straps for added support and comfort. No padding