The NeoAir XTherm is a true ultralight four-season pad that delivers serious warmth. With an R-value of 5.7, the XTherm will keep you warm during winter backpacking trips and comfy during summer outings. Its unique ThermaCapture layering technology helps trap and redirect radiant heat without bulky insulation, while an extra layer of textured nonslip fabric provides next-to-skin comfort. The 2.5-inch baffled internal structure provides extra stability and prevents you from rolling off while sleeping.