Far-infrared emitting ceramic enclosed Retains heat, preventing foot heat loss Encloses special ceramic Warms feet with a mild warmth 100% cotton This is written on the outer bag. Not a stretch material. Unopened. (Inspection has not been performed. No visible stains are apparent.) Stored at home, new and unused. As time has passed, I've marked it as "Like new." Will be sent via post with rain protection. We look forward to your purchase if you agree to the above. Thank you for viewing.