You move around when you sleep. Everyone does, but not all sleeping bags are designed with this in mind. This one is. __ Firstly, the construction and filling is the same all round so if you turn on your side or front you won't find the cold suddenly seeping in. __ Secondly, it stretches. So if you want to curl up or spread out the bag will stretch with you. And the SL model is slightly smaller because it is designed for women.__ This makes it an excellent all round sleeping bag for hikers, bikers and and anyone who wants a warm and comfortable sleep in temperatures around 5°C.__Separate drawcords on the ergonomically shaped hood for precise adjustmentErgonomically shaped foot section perfectly adapted to the natural foot posture, extra insulation section for added warmthDryzone at the head and feet protect from moisture with a water repellent shell fabricBody-warmer fleece inserts made from fluffy brushed Thermo Fleece keep the kidney zones, top and bottom warm ... More info