The specially developed YATE EXTREM LITE 3,8, where the lowest possible weight and volume after packing is taken into account. But at the same time, these mattresses provide excellent comfort and insulation capabilities, which are crucial factors for you to rest well and perform at your best even in extreme conditions. The top material is a non-slip micro brushed 75D polyester, so you won't slide down with your sleeping bag. Lightweight inner material and a mummy shape. WARM ZONE - under the back and the sides, the foam is lightened by horizontal channels and therefore there is more foam to ensure sufficient insulation. You don't carry unnecessary extra weight in your backpack and you can sleep comfortably.