Silk Couture Mens Sleepwear - Gorgeous Silk Pajama / Loungewear Pants M Black Super comfy and stylish sleepwear made of a beautiful fabric: 90% silk and 10% micro-fiber. The micro-fiber element of the fabric provides structure to this silk garment and increases its lifespan. Sleep pants have elastic at waist to snug up the fit and create a cozy feel against your skin. You will own and wear these exquisite & comfortable pants for a very long time!