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Space cowboy5/17/2023 ![]() ![]() This bag features “eraLoft” hollow-core microfiber polyester insulation that the company claims “repels water and possess excellent temperature regulation.” My test bag also features Therm-a-Rest’s ThermaCapture Lining, a proprietary reflective coating lining the interior of the bag “to trap radiant body heat and retain warmth without adding bulk or weight" ( see gray material, below). The images below offer a sense of scale of the stuffed size ( pack shown is Gregory Optic 58). Again, the Space Cowboy squeezes into a smaller stuff sack. In comparison, the Big Agnes Lost Dog 45 stuffs into a 7.5x15 in/ 19x38 cm bundle while the Marmot NanoWave 45 is listed as stuffing into a 7.5x1 in/ 19x30.5 cm bundle. Packed, the Space Cowboy long stuffs into a 7x10 in/18x25 cm bundle. The Space Cowboy weighs considerably less. For reference, comparably rated bags such as the Big Agnes Lost Dog 45 (long) weighs in at 1 lb 15 oz/ 879 g the Marmot NanoWave 45 (long) weighs in at 2 lbs/ 907 g. Therm-a-Rest proclaims it to be “among the lightest and most packable in its class. The bag’s rating is conveniently printed on its side, and this rating adheres to both EN and ISO standards (standards which standardized and then revised, respectively, the temp ratings of sleeping bags). I noted that Space Cowboy is a summer weight synthetic sleeping bag: that means it is rated to 45˚F/7˚C and weighs 20 oz/567g. The Space Cowboy I tested was a Long that came in Ether, but the bag comes in three sizes with specs indicated below: The Space Cowboy also comes in two colors (Ether and Galactic-gray or purple, basically) and three sizes. The Space Cowboy comes with Therm-a-Rest’s Warranty and Better Sleep Guarantee. The stuff sacks compacts the Space Cowboy down to a 7x10 in/ 18x25 cm parcel while the capacious storage sack prevents compression of the insulation and provides breathable storage between trips. ![]() Retention straps (“SynergyLink Connectors”): 19g each (x2) In addition to bag itself, the Space Cowboy comes with the following items: Attachment points also allow the bag to be attached to a sleeping pad to avoid slipping off at night (it comes with two straps for this purpose) as well as attachment points for other Therm-a-Rest quilts or blankets to allow for layering. It features draft tube and collar, cinchable hood, two-way zipper and has a shell of 20d polyester ripstop fabric with DWR treatment. Rated at 45˚F/7˚C and weighing 20 oz/567g, the bag compresses for packing to a size of 7x10 in/18x25 cm. The Space Cowboy is a lightweight, synthetic sleeping bag. I enjoyed testing the Space Cowboy in summer and early fall, but by layering the Space Cowboy with my Therm-a-Rest Corus HD 35˚F/1.7˚ C quilt, I was able to sleep comfortably in the upper 20s˚F/-2.8 to -1.6˚C, too, a layering option Therm-a-Rest had in mind when designing this sleeping bag. Therm-a-Rest’s Space Cowboy synthetic sleeping bag offers a fully featured summer-weight bag that is well suited for such warm-weather trips. It’s enough to encourage trip planning for summer treks. In the American South where I live, we’ve had the first few flashes of summer-like heat amid cooler spring weather. ![]()
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