Lenz Products Women's Set Lithium Pack rcB 1200 + Heat Sock 1.0 49% Polyester, 29% Polyamid, 10% Polyprpylen, 7% Merino, 5% Elasthan Imported Bluetooth remote control with your Smart/I-Phone Warm feet's with Lithium battery powered Heating socks For all winter Sports and Outdoor activities 3 heat settings with up to 14 hours heat