evo.com | Sea to Summit Sleeping Bags > The Sea to Summit Ascent(TM) 15 Sleeping Bag is the middle-weight bag in the Ascent line, which boasts the high-loft down, oversized draft collar and shaped hood that makes it the perfect warmth for all but the coldest weather expeditions. The innovative baffling system keeps the insulation from falling to your back like in a traditional horizontal pattern, but also keeps it from falling to your feet like in a traditional vertical baffle. This way, your core stays warm, keeping your whole body warm despite the lighter construction of the sleeping bag. Ultra-Dry Down 750+ Loft 90% Down Cluster Premium Duck Down Free Flow Zip The half-zip on the right side of the bag (left side on women's bags) provides freedom of movement for both arms, additional ventilation and allows the top third of the bag to be folded down as a mini quilt when the mercury climbs higher than expected. Responsible Down Standard Certified Lightweight 20D Nylon Shell Compressed Volume, Regular 6.2L | Sea to Summit Ascent(TM) 15 Sleeping Bag 2022 - Regular in Green | Nylon