Windproof U-shaped hood: Adjustable U-shaped hood tightens around the head to block cold air and retain body heat. Ideal when sleeping outdoors or in drafty shelters where head coverage matters for warmth. Converts to blanket or mat: The sleeping bag opens fully and lies flat, so it can be used as a blanket, ground mat, or single-layer cover. This versatility reduces the need to carry extra gear for different sleeping and rest situations. Durable polyester shell: Made from polyester treated with a dense warp-and-weft weave to increase wind resistance and protect against cold. The fabric stands up to repeated outdoor use and provides reliable performance in rough conditions. High-quality hollow-core cotton filling: The sleeping bag uses hollow-core cotton filling for effective insulation and comfortable support. The filling balances warmth and compressibility to make packing and carrying easier. Why you need it Keeps you warmer by blocking wind at the head and trapping body heat overall. Simplifies packing by combining sleeping bag, blanket, and mat functions in one item. Designed for rugged outdoor use with fabric and filling that resist wear and provide dependable insulation. Key attributes Function: Wind-resistant sleeping bag with adjustable hood; converts to flat blanket/mat. Material: Polyester outer fabric with dense warp-and-weft treatment; hollow-core cotton filling. Performance: Improved wind resistance and cold protection; comfortable insulation; durable for outdoor use. Practical use scenarios Camping and backpacking: Use as a traditional sleeping bag at night, then open it to serve as a blanket or ground mat at camp during the day. Road trips and emergency kits: Compact and multi-functional for emergency warmth, roadside rest, or quick shelter when sleeping in a vehicle or temporary shelter. Outdoor events and work: Provides a warm, portable cover at festivals, fishing or hunting trips, and while working or resting outdoors in cool conditions. What it delivers Reliable wind resistance and heat retention from hood to foot. Simple, versatile functionality to reduce packed items. Durable materials and insulating filling for repeated outdoor use. Care note Follow standard care instructions for polyester outer fabrics and hollow-core fillings to maintain performance and longevity.