This premium quality, Professional Mummy Sleeping Bag is made from a durable 190T polyester outer shell, with an ultra-warm 300GSM double filling for use throughout the year. Both the compression bag and sleeping bag's outer shell are water resistant in damp environments, and its easy to wash and maintain too. Instead of a single filling, this professional sleeping bag is packed with a double layer containing 2 x 150g/m hollow fibre layers, and a drawstring hood. This provides a considerable increase in insulation and warmth compared to a regular single-layered sleeping bag and is ideal for use outside in both winter and summer.