Used Once: Wrap up your day with the 20-Degree Mummy Bag, sewn up to perfection for exceptional warmth, compressibility, and comfort without unnecessary bulk. Premium 1000 fill power grey goose down treated with a DWR finish provides maximum loft and reliable insulation, while 3-dimensional baffles allow the bag to fully loft to 2.75 inches for efficient heat retention. An ultralight 7D micro-ripstop nylon shell and lining balance durability and breathability for dependable and consistent performance you’ll look forward to throughout your cooler season adventures. Draft tubes along the zipper, neck, and hood help seal in warmth, while cinch cords and a parka-style hood create a secure, cozy fit through the night. Continuous horizontal baffles allow you to shift insulation as conditions change, and a small chest pocket keeps essentials within easy reach. see: https://hyperlitemountaingear.com/products/20-degree-mummy-bag