The warmest of the Trek series, the Sea to Summit Trek Tk III Sleeping Bag is an excellent companion for those colder nights camping out on the trail. Features: Down: ULTRA-DRYDown 650+ Loft 85% Down Cluster Premium Duck Down Season ratings: Spring, Autumn, Winter-lite Suggested use: Backpacking; Travel; Hiking; Camping Specs: Size Variation: Regular/Left ZipCompressed Size: 7.05 liter Fill Weight: 24.7 oz Bag Weight: 2 lb 10 ozTemp Rating: 12 F (EN Lower Limit) /-11 C (EN Lower Limit) Color: Orange