Spring Lake Sleeping Bag (Synthetic)

The Spring Lake is the in between rectangle bag of the ALPS Mountaineering line. 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 tocozy up with.