If you need a lightweight sleeping bag that'll keep you comfortable in a wide range of conditions, then this is the bag for you. The Seat to Summit Talus TsII is incredibly versatile, windproof, and highly water resistant, which means it'll perform well in all but the most extreme environments. . Relaxed mummy shape maximizes thermal efficiency and minimizes overall weight larger hood, broader shoulder, and large chest area provide excellent comfort. 750 Fill Power Premium European duck down is a high quality insulation treated with ULTRA DRY Down ULTRA DRY Down treatment is a permanent nano level water repellent polymer that vastly improves the down's reaction to water without affecting its weight or loft performance ULTRA DRY also inhibits bacterial and microbial growth, making the bag more hygienic and long lasting Treated down retains over 60% more loft, absorbs 30% less moisture, and dries 60% faster compared to untreated down. 2D NanoShell fabric is a durable 20D high density weave nylon treated with DWR and a thin microporous coating to provide maximum protection from wind and moisture. Differential cut shell and lining helps the down loft correctly for superior thermal efficiency. Offset baffle construction provides a stable structure that allows the down to loft to the right density and minimizes loss of heat through seams. Hood is designed to cocoon your head completely without feeling claustrophobic adjustable collar lets you fine tune temperature control. Anatomically tapered foot box mirrors the natural position of your feet when lying down and relaxed to prevent cold feet. YKK 5 reverse zipper allows you to unzip the bag from top and bottom for better temperature regulation. Super high density 210D polyester cloth hidden in the draft tube is exceptionally stiff and eliminates zipper snagging. Discreet internal zippered pocket keeps small items safe and secure.