ALPS Mountaineering Spring Lake +45
Here's what other sites are saying:
With synthetic insulation, the ALPS Mountaineering Spring Lake 45 Sleeping Bag has the right amount of warmth for warm-weather camping.
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.