Stored at home. Unknown if purchased or received as a gift. Found this when searching for it among family belongings: "olleha" brand thermal socks (room socks) High heat retention and moisturizing effect. Size: M size, 1 sock Material: Mainly uses neoprene material (polyester), highly elastic and stretchy. Effects: High heat retention, also useful for preventing cracked heels due to dryness. Usage scenarios: Non-slip print is applied, making it suitable for indoor use. Washable If using the post office, it may take about a week for delivery depending on your region, the shipping date, and the time of day. Please understand.