ALL YEAR AROUND: Stay warm in cold weather with our sleeping bag winter featuring 400 GSM innovation fiber filling for maximum warmth and cloud-like comfort. Built from 510GSM cotton, it's ideal for 3-4 seasons, with a temperature range of 41℉-77℉ (5-25°C). Our Backpacking sleeping bag is Ideal for camping, backpacking, hiking, and outdoor adventures High-Quality Material: Crafted from premium materials (190T polyester taffeta outer layer + 190T polyester pongee inner lining + cotton filling), the ultralight backpacking sleeping bag for adults and all ages is superior compared to sleeping bags on the market, more comfortable and better insulated which can serve you for a very long time. The sleeping bag is a good gear for traveling and walking Strong and Comfortable: It is designed for kids and adults, featuring ultra-strong ripstop hexagonal weave and fiber filling for optimal warmth and insulation. The durable design protects against the elements.