evo.com | Sea to Summit Sleeping Bags > The Sea to Summit Ascent(TM) 25 Sleeping Bag is the least insulated in the Ascent line, but still boasts the high-loft down, oversized draft collar and shaped hood that make its thicker siblings so warm. 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. Lightweight 20D Nylon Shell 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. Compressed Volume, Regular 4.9L Responsible Down Standard Certified | Sea to Summit Ascent(TM) 25 Sleeping Bag 2022 - Regular in Green | Nylon