Silk Couture Mens Gorgeous Silk Pajama / Loungewear Pants Super comfortable and stylish nightwear made from a high quality and very comfortable fabric: 90% silk / 10% micro-fiber. The micro-fiber element of the fabric provides structure to this silk garment and increases its lifespan. Sleep pants has elastic at waist to snug up the fit and create a cozy feel against your skin. Relaxed styling provides a comfortable and casual fit.