Unopened Neck Warmer Will be slightly compressed and shipped in simple packaging. Due to thickness, it will be opened and folded again, and the outer box will be included for shipping. Thank you. From the internet ↓ The special knit weave that prevents body heat from escaping is based on patented technology. The part that touches the skin uses 100% silk (white part), and ceramic charcoal from Shizuoka with far-infrared function is applied to it. (The surface uses cotton.) Product Name: Silk and Charcoal Neck Warmer Material: Inside: 100% silk (ceramic charcoal coating) Outside: 100% cotton Material of the rubber part between silk and cotton: Uses polyester and polyurethane * Ceramic charcoal coating is on half of the inside.