Vevor Heated Socks Rechargeable 5000mAh Small Size App Control Foot Warmer NewThese rechargeable heated socks are designed to deliver consistent warmth for cold weather work and outdoor activities. They feature four heat levels, app and button control, and heating coverage around the toes, soles, and tops of the feet. The socks are made with modal core yarn and faux mink fleece for a soft, comfortable feel. Dual batteries provide extended warming time, and the socks can be machine or hand washed with the included laundry bag.