The Therm-a-Rest Saros Sleeping Bag can offer blissful sleep from late spring through early fall. Synthetic insulation resists moderate-cold temperatures, and an external water-resistant coating helps the shell repel light moisture. This is a rugged and reliable Material: [face fabric] 20D polyester, DWR treatment, [lining] 20D polyester taffeta Insulation: eraLoft (polyester hollow fiber) Shape: Mummy Zipper: full-length User Height: [small] 5ft 5in, [regular] 6ft, [long] 6ft 6in Shoulder Room: (small) 58in, (regular) 63in, (long) 66in Bag Length: (small) 73in, (regular) 80in, (long) 85in