The Nemo Tensor All-Season is a lightweight 4 season backpacking and camping mat that uses light and packable materials and insulation to create a very warm 5.4 R-Value pad in an impressively light and compact design. The body of the mat is constructed from a combination of 20D nylon top and tougher more abrasion resistant 40D nylon on the bottom. To keep you warm on cold nights the Tensor uses two suspended layers of ultra-thin, metallized Thermal Mirror film, which efficiently reflects body heat. The layers clever floating construction eliminates the crinkling, crunchy sound that many insulated air pads are known for, earning Tensor a reputation for peace and quiet. The Tensor takes it's name from Nemo's proprietary Spaceframe baffle design, which utilizes low-stretch fabric trusses to create stable support and offer just the right amount of give. This means that when lying on your side your hip will not touch the ground. The Tensor comes with Nemo's Vortex pump sack that makes inflating the bag easy, saving your breath and preventing moisture getting into the mat. The Laylow valve sits flat against the mat and can be used to make micro adjustments to the inflation of the mat so you get the perfect firmness for you. Nemo Tensor All-Season Features 20D (top) and 40D (bottom) nylon Two layers of floating Thermal Mirror metallized film Spaceframe baffles offer unparalleled stability and weight distribution Microadjustable Laylow valve Impressively quiet Included Vortex pump sack, repair kit, stuffsac & velcro strap.