Fleece foot warmer with heating function, hand washable, and one size fits all. - Product Name: Epice Foot Warmer - Material: Fleece - Features: With heating function - Size: One size fits all - Washing Instructions: Hand washable I received this as a gift but have never used it. I opened the package once to take photos. I hope someone who understands that this has been stored at home will purchase it. Thank you for looking.