Four seasons, one bag. The 4-Season Cotton Sleeping Bag is engineered for adventurers who camp year-round and need reliable warmth when temperatures drop. Rated from 0°C to -10°C, this winter-ready bag combines a soft cotton fill with a durable terylene envelope shell to deliver consistent insulation across spring, autumn, and winter conditions. The mummy-influenced envelope design balances the snug heat retention of a mummy bag with the roomier feel of an envelope style — giving you warmth without feeling confined. At a lengthened fit suitable for adults up to 2 m tall, it’s a bag that accommodates without compromise. The splicing zipper lets you connect two bags for a double configuration when the night calls for it. Specifications Specification Detail Model BBB-SP Style Envelope / Mummy Hybrid Filling Cotton Shell Fabric Terylene Temperature Rating 0°C to -10°C Season 4-Season (Winter Primary) Suitable Height Up to 2 m (Lengthened) Splicing Yes – single or double configuration Applicable Users Adults Available Colors Green, Red, Blue Why Choose This 4-Season Sleeping Bag? True 4-Season Versatility: Rated to -10°C but comfortable across all seasons — one bag that earns its place in your kit year-round. Cotton Fill for Breathable Warmth: Natural cotton insulation provides soft, breathable warmth that regulates temperature many synthetics in moderate cold. Durable Terylene Shell: Resistant to wear and tear, the terylene outer layer holds up across multiple seasons of hard outdoor use. Envelope-Mummy Hybrid Design: More room to move than a pure mummy bag, with better heat retention than a standard envelope — of both styles. Splicing Compatible: Join two bags for a double sleeping bag — i for couples or extra warmth on the coldest nights. I For Winter camping and cold-weather backpacking Year-round outdoor adventures Trekkers and hikers in sub-zero conditions Couples camping (splicing two bags together) Tall adults needing a lengthened fit (up to 2 m) In the Box 1 × 4-Season Cotton Sleeping Bag 1 × Compression carry bag