For the lightest possible pack, Therm-a-Rest crafted the Vesper 45F/7C to deliver the essential warmth needed for mild-weathered pursuits. To keep it light, Therm-a-Rest used powerful 900 fill Nikwax Hydrophobic Down certified by the Responsible Down Standard. Designed with high-quality materials and Therm-a-Rest performance features like SynergyLink connectors, a snap neck closure, perimeter side baffles and an insulated footbox provide warmth and comfort in the backcountry. When compared to sleeping bags, the Vesper quilts save weight and pack smaller by utilizing the warmth of your insulated pad. 900 fill Nikwax Hydrophobic Down: Absorbs 90% less water and dries 3 times faster without using dangerous PFCs. Unrivaled Packability: Lightweight materials and precise design pack into a minimalist compression sack. SynergyLink Connectors: Removeable ultralight straps create a secure bag-to-sleeping pad connection that optimizes the comfort and thermal efficiency of your entire sleep syste