Power: Powered by USB (not included), offering infrared heating which is safe and non-radiating. Material: Made from 100% polyester. Coats and jackets: Get a women's thermal heated gilet. Three temperatures: Vary between level 45℃ (red light), 35℃ (white light) and 25℃ (blue light) depending on your needs. Five colours: Choose between white, grey, red, blue and black. Sizes: Valid in UK sizes 8-18. Women's Thermal Heated Gilet | Blue | Living Social