Never Used Thermarest Trail Lite Regular size. R-Value of 3.2, packs down to a reasonable size (Nalgene in the photo for reference). Selling as I was given a different one that packs down smaller right after I bought this one. Details can be found here: https://www.thermarest.com/ca/sleeping-pads/trek-and-travel/trail-lite-sleeping-pad/trail-lite.html