Klymalite™ lofted synthetic insulation creates additional warmth that lasts through the night. Take on cold conditions without sacrificing comfort or pack size. Klymalite lofted synthetic insulation in the pad offers exceptional warmth without the dreaded crinkle noise of other insulated pads. The exclusive V-Chambers and dynamic side rails also limit the movement of air, helping warmth stay closer to the top of the pad—meaning closer to you.
Review from rei.com:
"I put this pad through the ringer for sure. I used it no less than once per week during June, July, and the first half of August. It still looks good as new. This pad is incredibly comfortable for all types of sleeping positions. At an R-value of 4.4, it packs down to just slightly bigger than a Nalgene water bottle and weighs only 25 oz. The bag that it comes with is slightly oversized, which means that you can actually get it back in the bag with little issues every time even if your roll is slightly sloppy. It also comes with a patch kit so you can fix it in the field should an issue arise, not that I have ever needed it. I can also attest to Klymit's customer service as well. Prior to getting the Insulated Static V, I owned one of the original Static V pads. That pad survived from 2012-2016 until the valve developed a slight leak. I contacted Klymit to check out their warranty. They told me pads are covered under a lifetime warranty and after shipping it back to them I received a brand new pad within 2-3 weeks if I'm remembering correctly. So not only are the products great, but they stand behind them too!"