The Sea to Summit Comfort Light Insulated is a fairly warm pad with a new and unique design. With an R-value of 4.2, this pad is warm enough for cold weather use. The AirSprung Cells provide a lot of support and help prevent the edge collapse issues of horizontally baffled pads. This product provides a lot of support and a decent level of comfort; however, we didn't like it as much as our Editors' Choice winning Therm-a-Rest NeoAir XTherm, which is 5 ounces lighter, warmer, and a little more comfortable. The Sea to Summit UltraLight is the lightweight, uninsulated cousin of this pad and we liked it more because it packs down super small, is just as comfortable, weighs 8 ounces less, and is $70 cheaper.
Sea to Summit now includes an Air Stream Dry Sack Pump with all of their Air Sprung Cell sleeping pads. It is a stuff sack, dry sack, and pad inflator all rolled into one. Here's an instructional video of how the Air Stream Pump works.