- Inner comfort and warmth: The interior uses a high-density feather under-textile with a silky feel. It stays soft like a premium fabric and heats quickly for a warm, comfortable experience. - Easy temperature control: Three levels with color indicators for quick reference: high (red), medium (blue), low (green). Temperature can be adjusted to suit different needs. - Fast heating: 3-second heat up after connecting a USB power bank. To start heating, long-press the switch. - Durable exterior: Outer fabric is tear-resistant 210T check material and waterproof, helping protect against spills and accidental liquid contamination. - Flexible cooling/heating and movement: Breathable foot design with adjustable cooling and heating. The bottom can be opened independently for airflow and freedom of movement. - Compatibility and power: Uses a standard USB power bank (not included) to supply heat. - Practical use scenarios: - Overnight camping or base camp in cool nights. - Outdoor events or stadium seating in chilly conditions. - Travel, hotel stays, or car journeys where instant warmth and dryness are beneficial.