Women Winter Warm Electric USB Heated Thermal Underwear Set Smart electric heated underwear with 8 carbon fiber heating elements to warm key body areas including shoulders, chest, abdomen, back, waist, buttocks, elbows, thighs, and calves Powered by any standard 5V/2A USB charger; compatible with most portable power banks Heats up within 30 seconds; features 3 adjustable heat settings with LED indicator lights for temperature control Designed with safety insulation and built-in overheat protection; operates at safe 5V voltage and automatically shuts off if overheating occurs Washable design with protective components to prevent damage during washing Thermal heated base layer helps support blood circulation and comfort; ideal for individuals sensitive to cold or with circulation concerns Perfect for outdoor activities such as skiing, fishing, jogging, hunting, cycling, hiking, motorcycling, snow shoveling, and winter walking Name: Heated Thermal Underwear Set Color: Black, Purple Material: 91.1% Polyester + 8.9% Spandex, Carbon Fiber Yarn Sizes: M, L, XL, 2XL, 3XL, 4XL Heating Temperatures: Red LED (50C), White LED (45C), Blue LED (35C) Power Supply: USB power bank (not included; 10,000mAh recommended for 57 hours of use) Season: Autumn, Winter Package Includes: 1 x Heated Thermal Top 1 x Heated Thermal Bottom Note: Power bank not included