Specially designed to provide you with year round comfort, this Kulkyne Big Boy sleeping bag is perfect for camping during any season. It's constructed from the highest quality materials and fits to your mattress to keep it in place all night. It provides an astounding four different temperature ratings making it ideal for optimal comfort during any season. This sleeping bag keeps your warm in winter with a -10 degree rating, keeps you comfortable without getting too hot in autumn, has a removable inner for suiting milder weather and a summer sheet for comfort even in the hotter months. The inner lining is made with 100% cotton for excellent breathability without irritating your skin.