Boost 650 20F/-6C Sleeping Bag
Price range: $239.99 through $319.99
Find your ideal balance of space and warmth. With a customizable shape, the Therm-a-Rest Boost 650 20F/-6C sleeping bag transforms from a roomy semirectangular bag to a thermally efficient mummy bag.
Temperature ratings are intended as a guideline to help you compare products, rather than a guarantee of warmth, since many different factors contribute to your comfort while you sleep. Backpacking bags are typically rated for temperature according to an independent testing protocol—currently International Organization for Standardization (ISO) 23537, though some older items followed European Norm (EN) 13537. Testing is based on a person wearing one base layer and a pair of socks, sleeping on an insulated surface with a minimum R-value of 5.38.
Each bag then gets 2 ratings: the Comfort rating is the lowest temperature at which the bag will keep the average “cold sleeper” comfortable, and the Lower Limit rating is the lowest temperature at which the bag will keep the average “warm sleeper” comfortable. Some brands determine their own temperature rating by aligning to the Comfort rating for women’s bags, to the Lower Limit rating for men’s bags, or somewhere in the middle for nongendered bags.
| Best Use | Backpacking, Backpacking, Backpacking, Backpacking, Backpacking, Backpacking |
|---|---|
| Tested Lower Limit | 20 degrees (F) – ISO, 20 degrees (F) – ISO, 20 degrees (F) – ISO, 20 degrees (F) – ISO, 20 degrees (F) – ISO, 20 degrees (F) – ISO |
| Tested Comfort | 32 degrees (F) – ISO, 32 degrees (F) – ISO, 32 degrees (F) – ISO, 32 degrees (F) – ISO, 32 degrees (F) – ISO, 32 degrees (F) – ISO |
| Temperature Rating (F) | 20 degrees (F), 20 degrees (F), 20 degrees (F), 20 degrees (F), 20 degrees (F), 20 degrees (F) |
| Temperature Rating (C) | -6 degrees (C), -6 degrees (C), -6 degrees (C), -6 degrees (C), -6 degrees (C), -6 degrees (C) |
| Weight | 2 lbs. 4 oz., 2 lbs. 13 oz., 2 lbs. 11 oz., 3 lbs. 5 oz., 3 lbs. 1 oz., 3 lbs. 13 oz. |
| Shell | 20-denier 100% recycled nylon ripstop, 20-denier 100% recycled nylon ripstop, 20-denier 100% recycled nylon ripstop, 20-denier 100% recycled nylon ripstop, 20-denier 100% recycled nylon ripstop, 20-denier 100% recycled nylon ripstop |
| Zipper Location | Left, Left, Left, Left, Left, Left |
| Insulation Type | Down, Down, Down, Down, Down, Down |
| Water-Resistant Down | Yes, Yes, Yes, Yes, Yes, Yes |
| Fill | 650-fill-power duck PFAS-free hydrophobic down (RDS), 650-fill-power duck PFAS-free hydrophobic down (RDS), 650-fill-power duck PFAS-free hydrophobic down (RDS), 650-fill-power duck PFAS-free hydrophobic down (RDS), 650-fill-power duck PFAS-free hydrophobic down (RDS), 650-fill-power duck PFAS-free hydrophobic down (RDS) |
| Fill Weight | 1 lb. 4 oz., 1 lb. 11 oz., 1 lb. 7 oz., 2 lbs., 1 lb. 10 oz., 2 lbs. 4 oz. |
| Sleeping Capacity | 1-person, 1-person, 1-person, 1-person, 1-person, 1-person |
| Lining | 20-denier 100% recycled nylon ripstop, 20-denier 100% recycled nylon ripstop, 20-denier 100% recycled nylon ripstop, 20-denier 100% recycled nylon ripstop, 20-denier 100% recycled nylon ripstop, 20-denier 100% recycled nylon ripstop |
| Sleeping Bag Shape | Semirectangular, Semirectangular, Semirectangular, Semirectangular, Semirectangular, Semirectangular |
| Fits Up To (in.) | 66 inches, 66 inches, 72 inches, 72 inches, 78 inches, 78 inches |
| Shoulder Girth (in.) | 63 inches, 75 inches, 64 inches, 76 inches, 65 inches, 77 inches |
| Hip Girth (in.) | 59 inches, 73 inches, 60 inches, 74 inches, 61 inches, 75 inches |
| Stuff Sack Size | 18 x 6.5 inches, 18 x 6.5 inches, 20 x 7.5 inches, 20 x 7.5 inches, 20 x 7.5 inches, 20 x 7.5 inches |
| Stuff Sack Volume | 9.8 liters, 9.8 liters, 14.5 liters, 14.5 liters, 14.5 liters, 14.5 liters |
| Compressed Volume | 7.1 liters, 7.6 liters, 8.7 liters, 9.4 liters, 10.9 liters, 10.1 liters |
| Gender | Unisex, Unisex, Unisex, Unisex, Unisex, Unisex |
| Sustainability | Down certified to the Responsible Down Standard (RDS), Contains recycled materials, Down certified to the Responsible Down Standard (RDS), Contains recycled materials, Down certified to the Responsible Down Standard (RDS), Contains recycled materials, Down certified to the Responsible Down Standard (RDS), Contains recycled materials, Down certified to the Responsible Down Standard (RDS), Contains recycled materials, Down certified to the Responsible Down Standard (RDS), Contains recycled materials |
| Color | Blue |
|---|---|
| Size | Regular Wide, Long, Long Wide, Short, Short Wide, Regular |
| Brand | Therm-a-Rest |
