When staying warm is as important as keeping your pack light, the ProLite Plus mattress is the perfect solution. Using proprietary, foam-perforating technology, we’ve created this mattress to provide exceptional warmth—up to 20% more than previous ProLite 4 mattresses—without added weight. It’s substantial enough to keep you comfortable while mountaineering or on ski tours, yet rolls up small and light enough that you’ll have no problem taking it as far as you want to go.