100% Polyester ✅ BEST YEAR ROUND SLEEPING BAG - Perfect for spring, summer, fall, and cool weather, with a rated temperature from 40°F to 77°F (optimal comfort temperature 62°F to 75°F). Keep yourself cosy, warm and safe in every situation at normal altitudes. The ultra-strong, waterproof outer protective shell is made from our unique waterproof hex-tech design, double-layered with S-shape stitching, and 3D inner synthetic fiber fill for optimal warmth and insulation to protect you from the elements. ✅ CAMP IN COMFORT FOR ALL AGES - Bring the comfort of your own bed to the great outdoors. Our camping sleeping bags are engineered to guarantee a good night's sleep after a hard day of activities. No matter how tough the terrain or long the day, sleep well with MalloMe. And with vibrant colors loved by both boys and girls, they're great for kids too!