This sleeping bag combines a waterproof polyester outer shell with an evenly distributed hollow cotton fill to deliver reliable warmth, comfort, and protection from moisture. Key benefits Waterproof outer fabric: polyester shell repels light moisture and helps keep the insulation dry so you stay comfortable in damp conditions. Even, fluffy hollow cotton filling: uniformly distributed insulation provides consistent warmth and a soft, comfortable feel throughout the bag. Comfortable and protective: the combination of quality polyester and hollow cotton reduces cold spots and improves overall sleeping comfort. Durable construction: made from quality polyester fabric for everyday outdoor use. Function and performance Insulates and protects: designed to retain body heat while shielding you from light moisture on the outside. Consistent warmth: the hollow cotton filling is evenly packed to maintain a uniform layer of insulation across the sleeping surface. Practical applications Camping: use as a primary sleeping bag for weekend trips where moisture resistance and comfort matter. Travel and hostels: compact solution for overnight stays when you need a soft, warm layer that resists damp environments. Emergency or backup use: keeps you warm and dry during unexpected overnight situations. Materials Outer: quality polyester (waterproof) Interior: fluffy, evenly filled hollow cotton for insulation and comfort This sleeping bag is focused on reliable warmth, comfort, and moisture resistance using proven polyester and hollow cotton materials.