Off-Set Double Layer Construction - Stitching is offset so cold spots don't form at the stitch lines. The layers are separated using an interlining layer to stop the fill snagging or lumping in the bag 100% Polyester Hexagon Ripstop 210T - A tough hexagonal ripstop polyester that is strong, highly breathable and washable 100% Polyester 190T Pongee - A soft touch Microfibre fabric that is a wonderful cosy, snug and breathable. Single Hole Siliconised Hollow Fibre Insulation - Siliconised fibres reduce matting of filling, increasing durability and maximising the lofting potential for extra warmth. Retains loft in damp conditions 3-D Hood With Drawcord Closure and Shaped Sides - The 3-D hood prevents heat loss from the head whilst the shaped sides provide additional comfort. The convenient drawcord closure allows for maximum adjustment. Insulated Adjustable Shoulder Baffle stops heat escaping from the top of the bag when moving around at night. The adjustable cord lets you tighten or loosen it increasing both comfort and heat retention Insulated Zip Baffle helps to retain body heat within the sleeping bag whilst keeping out colder air. Two-Way Auto-Lock Zip: This versatile two-way zip can be used to seal in warmth or provide ventilation and can be used from inside the bag. The auto-lock feature prevents the bag from opening when moving around during the night Zip Guard with Anti-catch Piping helps to prevent the zip from snagging on the lining, allowing easy opening and closing Internal Pocket conveniently placed to provides storage for phones, MP3 players and other small essentials Temperature Ratings Independently Measured in Accordance with EN 13537:2002 Hanging Loops at the foot of the bag allow it to be hung up to air, keeping the bag fresh and dry between uses 4-Strap Compression Stuff Sac - Minimises pack size for easy transportation Square Shaped Bag - Also known as an envelope shape, the square or rectangular shaped bag offers generous internal space for freedom of movement and comfort. Horizontal Stitching, evenly spaced to hold insulation in place and to ensure that it is evenly distributed across the body The woven zip puller allows quick and easy operation of the zip.