Features: 1,3 gear heating temperature setting45/55/65and 5 heating zones, convenient to operate. 2, It can be washed and folded directly, and it is easy and convenient to disaemble the heating system. 3,5V USB charge port design is suitable for most portable charge devices. Skin-friendly and breathable material provides a smooth and comfortable wearing feeling. 4, Smooth zipper design for giving you all-around warmth and easy to carry. The component heating layer with a heating element generates heat for your back, neck, and abdomen. 5, Keeping you warm on cold days, consuming exce heat, increases blood oxygen and fluidity. Far infrared heating materials promote blood microcirculation, nice for relieving pain from muscles. Specifications: Size: M, L, XL, 2XL, 3XL, 4XL (Optional) Color: Black Material: Cotton Package weight: 550g / 1.21lb Package size: 350 * 260 * 40mm / 13.78 * 10.24 * 1.57in Package Included:1pc *heating vest