The Marmot Trestles 15 Degree is one of the best three season backpacking mummy sleeping bag values on the market. Bring the all-purpose Trestles 30Adeg Sleeping Bag - Long, built to perform in cool and damp conditions as you're backpacking, trekking, mountaineering, and more. SpiraFil(TM) high-loft insulation will keep you warm even when things get wet. After a long day of exploring, zip up the full-length two-way zipper, pull on the 3D hood, and give your feet a rest in the roomy 3D footbox. Its wave-construction top and blanket-construction bottom provide an unbeatable combo of maximum loft, warmth. If the interior gets too toasty, use the fold-down secondary zipper to get some air. Tuck small items into the stash pocket for easy access.Get the best out of your new Sleeping Bag click here for sleeping bag care instructions. FeaturesFold-Down Second Zipper Provides added Ventilation and Easy Access, Main Zipper Anti-Snag Slider reduces SnaggingAnatomically 3D Footbox increases the insulation and room for your feet, for more Warmth and ComfortSpirafil High Loft Insulation for Maximum warmth and durabilityEN TestedCombination Wave Construction Top provides Maximum Loft and Warmth, Blanket Construction Bottom for the best warmth and comfort under bodyFull Length Locking YKK Two Way Zipper3D Hood ConstructionStash Pocket"Feely" Draw CordsSnagless Insulated Draft TubeTwo Hang LoopsCompression Stuff SackProduct DetailsMain materials: 70D 100% Polyester 2.2 oz/yd | 70D 100% Polyester Embossed 2.2 oz/ydBag temperature(AdegF Fahrenheit): 30AdegF FahrenheitInsulation: SpiraFil LTLining: 70D 100% Polyester 2.2 oz/ydPack volume: 750.6ci >> 12.3 litersWeight: 3lbs 5oz (1507g)Zipper position: LZ, RZ