The Klymit Inertia X Frame is an ultralight air mattress that uses Klymit's unique body mapping technology to provide targeted support with minimal surface area. Size: 183cm long x 45cm wide x 3.8cm thick, Weight: 278g (including stuff sack, repair kit, and pump). This is a used item. It functions perfectly and is still in good condition. (I haven't used it since last summer, but I inflated it to check, and there appear to be no leaks.) The manufacturer recommends using it inside a sleeping bag, but I used it under my sleeping bag in the summer like a regular mat, so it can be used either way. The included black pump is used for air adjustment. It's slightly dented, but there are no tears. Despite its appearance, it's surprisingly comfortable, making it an easy-to-use and portable air mattress. Integral Designs Sixmoon Designs ZEROGRAM Locus Gear HERITAGE mont-bell MSR NEMO THERM-A-REST SEA TO SUMMIT KLYMIT EVERNEW Zpacks MoonlightGear 山と道 U.L. HIKE & BACKPACKING