These trainer liners are designed to hide neatly inside your trainers these blister resist socks have a clever double layer construction to help prevent blistering our technology keeps cotton looking and feeling new and brighter for longer style sustainable cotton added stretch blister resist care and composition composition 70 cotton 27 polyamide and 3 elastane inner fabric 87 polyamide 9 cotton and 4 elastane care instructions machine washable tumble dry