Got this bag in late 2017 and have had about 20 nights in it- up till now, early September 2018. So far, so good, light weight bag rated down to 10-22F. Bought it specifically for a shoulder season bag, especially late summer/early winter. Saturday night (first of Sept) was spent camped at about 6000'. By 10 the dew had fallen like a brick, tent was very wet on the outside. And I was beginning to notice the bag was cold on the bottom. Was on a T-rest neo air. If I rolled around, I could easily feel the cold top of the t-rest, and the bottom of the bag never warmed up. Finally I rolled completely over. The top of the bag was fine as the bottom, but the bottom never warmed up.