This Thermarest cot uses technical lightweight components to raise the sleeping area off the ground to ensure a comfortable nights sleep. Bow frame technology uses composite feet clips & quality aluminium poles to create a sprung frame to support the top sleeping sheet. The Bow frames can be configured as double pole Twist Bow for heavier users or Single pole Bows for lighter users. Two strong shock corded poles are threaded into sleeves running down the length of the sleeping sheet to form a stretcher & then the Bow Frames are simply clipped on to create the strong & flexible feet. You can even mix & match twist & single bows to custom build your cot. The sleep mat itself is made from a stretch free, waterproof & lightweight polyester ripstop fabric that is incredibly durable & will withstand the rigours of outdoor use. The major advantage of the sprung Bow Frames is that they are not in contact with your body, they flex with your movement & they do not squeak, ensuring a comfortable & peaceful nights sleep. This Ultralite cot provides superb comfort but offers minimal insulation from the cold ground, we would always recommend the use of a good insulating mat on top of the cot in cold conditions. Bowframe technology Ultra lightweight construction & components Compact pack size Tough Nylon top sheet Three minute set up (with practice)