Product Description: Experience all-season warmth with this innovative USB-heated sleeping bag. Featuring four adjustable heating zones across the back, waist, and legs, it delivers targeted warmth from any 5V/2A power bank, making it i for winter camping, hiking, and cold-weather travel. The waterproof 210T polyester shell and down cotton insulation provide reliable protection and comfort down to -5°C, while the envelope design ample room to move. Lightweight and packable, this versatile sleeping bag includes a hand-access slot, splash-proof zipper, and can be zipped to another for double use—combining smart heating technology with essential outdoor gear. Product Specifications: Feature Specification Heating Technology 4-Zone Carbon Fiber Heating Pads Power Source USB (5V/2A+ Power Bank Required, Not Included) Temperature Settings 3 Levels: Low (30-35°C), Medium (40-45°C), High (50-55°C) Outer Material Waterproof 210T Tear-Resistant Polyester Insulation Down Cotton (Synthetic Fiber) Comfort Temperature Down to -5°C (23°F) Size Options (Length: 210cm, Width: 75cm or 85cm) Weight From 1.8 kg (Lightweight) Special Features Hand-Access Slot, Spliceable Zipper, Bottom Vent Additional Details: Adjustable Targeted Warmth: Independently controlled heating zones allow personalized comfort across your back, waist, thighs, and legs. All-Weather Protection: Waterproof and wind-resistant exterior with breathable down cotton lining ensures warmth and dryness in damp conditions. Versatile & Packable: Functions as a sleeping bag, wearable blanket, or emergency heat pad, and compresses into its carry bag for easy transport. User-Focused Design: Envelope shape more room than mummy bags, includes a handy arm slot for phone use, and vents at the bottom to reduce stuffiness. Easy Maintenance: Machine washable (remove controller) and quick-drying materials make cleanup simple after outdoor adventures. Frequently Asked Questions (FAQs): Q1: What power bank is needed? A: A 5V/2A (or higher) USB power bank is required. A 10,000mAh bank provides ~3–7 hours of heat depending on the setting. Q2: Can two bags be joined together? A: Yes, the side zipper allows two bags to be spliced into a double sleeping bag for couples. Q3: Is it completely waterproof? A: The outer fabric is water-resistant and splash-proof, suitable for damp ground and light moisture, but not fully submersible. Q4: How do you wash the sleeping bag? A: It is machine washable. Remove the USB controller and place the bag in a gentle cycle, then air dry thoroughly. Q5: Can it be used without heating? A: Absolutely. It functions as a standard insulated sleeping bag—the heating feature is optional for extra comfort in extreme cold