3 Degree, Summit, and Sling are all made of at least semi-glossy nylon plastics, and feel like they’re filled with down. The most immediate visual and tactile comparison for most of the versions is a high-end sleeping bag, though the glossiest white version could be confused with a common Hefty bag. Like camping gear, these sleeves seem like they would tear easily but are actually rather resilient. 3 Degree is the most basic of the three designs.…
