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- Microfiber liner; 8 separating zippers
- 210T nylon rip stop outer
- Two layer construction
- Standard stuff sack
- TechLoft+ Insulation
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The Spring Lake is our in-between rectangle bag. Unlike the Summer Lake bag that only has insulation on one side, the Spring Lake has 20 oz. of TechLoft+ on each side, or 40 oz. total. The single layer of TechLoft+ is sewn-thru, but a loose outer improves the thermal efficiency. The Spring Lake bag is great for those cool spring or summer nights when you just need something to cozy up with.