The ALPS Mountaineering Summer Outfitter 45 Degree Sleeping Bag is a great choice for rental programs or any situation where the bag will see heavy use from various people. The 45-degree rating makes this sleeping bag perfect for hot summer days with cooler summer nights. It also features a large #10 zipper, 210T polyester liner and outer fabric, so it will last time and time again through rugged and repeated use.Features210T polyester liner210T polyester outer fabricPolyLoft insulation2-layer constructionIncludes elastic straps