The full-featured Trestles 15 is a reliable, all-purpose synthetic bag that insulates even in sustained cold and damp conditions while backpacking, trekking and mountaineering. We&';ve added improved liner fabric and style lines for increased comfort.Product Specifications FEATURES of the Marmot Trestles 15 Sleeping Bag Fold-down second zipper provides added ventilation Easy access Anti-snag slider reduces snagging Anatomically 3D footbox increases the insulation and room for your feet, for more warmth and comfort Spirafil high loft insulation for maximum warmth and durability EN tested Combination wave construction top provides maximum loft and warmth Blanket construction bottom for the best warmthTECH SPECS Sustainability: Responsible Down Standard Extreme Temperature Rating: -27.2 Degrees Fahrenheit Sleeping Bag Shell: 70D 100% Polyester Sleeping Bag Lining: 70D 100% Polyester Fill Weight (Regular): 36 oz Shoulder Circumference (Regular): 62 in. Hip Circumference (Regular): 57 in Weight (Regular): 54 oz Product Technology: Marmot SpiraFil Best Use: Camping Insulation: Synthetic Temperature Rating: 11 - 20 Degrees Fahrenheit Exact Temperature Rating: 15 Degrees Fahrenheit Sleeping Bag Shape: Mummy Max User Height (Regular): 72 in. Zipper Location: Left/Right Lining: Polyester Shell: Polyester Fill: SpiraFil LT polyester fibers