The insulation batting in the Snowfall sleeping bag is arranged somewhat like roof tilesthis structure is warmer than simply stitching through a single layer of insulation. The temperature ratings are suitable for summer, late spring, and early autumn. The bag is a so-called mummy shape, meaning it is narrower at the foot end. However, this is not an extremely narrow sleeping bag. A practical detail is that the adjustment cords for the hood and the thermal collar are intentionally made from different materials, so you can tell by touch which one you're adjusting. The bag has a left-sided zipper, which is the most common choice for right-handed campers. - Ergonomic hood - MicroThermo High Loft insulation fiber - Thermal collar prevents the bag from "pumping out" the warm air youve heated with your breath or when you turn onto your side - Insulation tube along the main zipper - Shark-fin-shaped foot section allows feet to rest naturally without compressing the insulation - Comes w