This new large-area heating vest adopts black technology electric heating, four-control switch, three-speed temperature control, rapid heating, and constant temperature warmth. Composite carbon fiber heating, good thermal conductivity, lasting constant temperature. It can be washed directly, convenient and practical. Features: Large-area heating, rapid cold driving, constant temperature warmth, making you feel warm as spring even in the cold winter. Four-control switch, three-speed temperature control, to meet different temperature needs. Composite carbon fiber heating, good thermal conductivity, lasting constant temperature, keeping your body at a comfortable temperature at all times. Can be washed directly, convenient and practical, no need to worry about cleaning problems. Just one power bank can make you warm instantly, no need to worry about power supply problems. Specifications: Material: 100% polyester fiber Color: Black Size: L/ XL / XXL / XXXL Package size: 55x40x3cm / 21.7x15.7x1.2in Package weight: 3XL 500g / 17.6oz (The weight varies about 20g depending on the size) Package List: 1 x Heating Vest