USB-powered heated sleeping bag designed to keep you warm and comfortable even at temperatures close to freezing. Key benefits Reliable warmth near freezing: Built to maintain body heat in cold conditions so you stay safe and comfortable when temperatures drop. Fast electric heating: Integrated USB heating warms up quickly when connected to a USB power source (power source not included), allowing rapid comfort on demand. Durable, weather-resistant construction: Tear-resistant 210T polyester outer shell with a waterproof finish helps block wind and moisture. Effective insulation: Hollow cotton filling traps and holds heat, reducing heat loss and improving thermal performance. Soft, breathable interior: Inner fabric is 210T polyester pongee — soft against the skin, breathable and comfortable for extended use. Function and compatibility Heating function: USB electric heating element provides supplemental warmth; compatible with standard USB power sources such as power banks or USB adapters (not included). Practical design: Combines electric heating with conventional insulated sleeping bag construction for improved warmth without bulky layering. Materials and performance Outer shell: Tear-resistant 210T polyester with waterproof treatment for added protection from damp conditions. Filling: Hollow cotton filling for consistent insulation and heat retention. Inner lining: 210T polyester pongee for a soft, skin-friendly feel and breathability. Heating performance: Designed to heat up quickly and enhance overall warmth; use with a suitable USB power source for continuous heat. Typical use scenarios Cold-weather camping: Add warmth on chilly nights without heavy clothing layers. Road trips and overnight driving: Use in a parked vehicle to stay warm and comfortable while resting. Emergency preparedness and power outages: Provides a heated sleeping option when heating systems are unavailable. What to expect A personal heated sleeping bag that combines electric heating with durable, waterproof outer fabric and comfortable inner lining. USB-powered heating requires an external USB power source (not included); follow the power source and product safety instructions when in use. Materials summary Outer: 210T polyester (tear-resistant, waterproof) Filling: Hollow cotton Inner lining: 210T polyester pongee Heating: USB electric heating element This product delivers fast, supplemental warmth with durable materials and a comfortable inner lining for practical use in cold, near-freezing conditions.