Klymit Insulated Static V Sleeping Pad polyester BODY MAPPING TECHNOLOGY:Our patented V-shaped design delivers support and comfort no matter how you sleep  on your side, stomach or back. KLYMALITE SYNTHETIC INSULATION: Lightweight, compressible and durable, advanced synthetic insulation in the chambers slows the transfer of air between the top and bottom halves of the pad for improved thermal performance. SUPPORTIVE SIDE RAILS:Integrated into the patterning and construction, they provide a secure, comfortable sleep by centering you on the pad and inhibiting air movement while tossing and turning. DEEP WELD PATTERNING:Unlike traditional pads that flatten the bags fill, Deep Welds create expansion zones that allow your bag to fully loft beneath you for improved thermal comfort. TWIST-PULL VALVE: Secure and simple, it allows inflation in as few as 10 breaths and opens wide for rapid, complete deflation.