Reliable Four Season Warmth in a Lightweight DesignThe Klymit Insulated Static V Sleeping Pad delivers dependable comfort and packability for cold weather adventures. With an ASTM R value of 4.2 it uses multiple layers of reflective film and synthetic insulation to help shield you from the cold ground. The signature V shaped body mapping design provides ergonomic support in any sleeping position while integrated side rails help keep you centered through the night. Deep weld patterning allows your sleeping bag to loft fully beneath you for improved thermal performance making this pad a compact durable and warm solution for year round use. ASTM R value of 4.2 for reliable four season insulation Reflective film and synthetic insulation reduce heat loss V shaped body mapping design supports multiple sleep positions Side rails help keep you centered and stable Deep weld patterning enhances sleeping bag loft and warmth