The high quality mats in the Ultimate series offer superior sleeping comfort. The upper side of the Ultimate XW 10.0 is made from delightfully soft brushed polyester. For added comfort, the top layer is stretch-processed, so the sleeping mat can easily adapt to your body contours. The underside of the Nomad Ultimate XW 10.0 is treated with anti-slip material, so you won't be bothered when sleeping on non-horizontal surfaces. The high quality, high densitity foam used to fill the mat provides optimum support and insulation. Horizontal perforations in the foam reduce weight. The Nomad Ultimate, despite its large dimensions, is a compact and very lightweight sleeping mat that is easy to take with you everywhere. The Ultimate series is equipped with easy to open and close valves that have an integrated bi-directional function.