The Rab Stratosphere 4 Sleeping Pad is ideal for summer backpacking and camping trips, and it has just enough polyester-based Stratus R insulation for some spring and autumn trips, too. It's a lightweight air mat that packs small, and the water-resistant exterior helps the mat retain its air overnight. Oversized outer chambers make it easier than ever to stay in the middle of the sleeping pad, even if you tend to toss and turn. Rab included a stuff sack that doubles as a pump for even better inflation.