I ordered one of these 10 degree bags in regular and one in wide for my husband. We are both restless sleepers and did not want mummy bags. After much research, I took the plunge. We both love the freedom to customize the configuration of the bag by either affixing it to the straps (and hence, sleeping pad) cinching the bottom, or zipping up the entire bag. The down lofted beautifully, and kept us toasty warm down (with only cinching the feet) to about 40 degrees with a good insulated sleeping pad below. I look forward to testing this in cooler temps; based on how well it performed at warmer temps I'm confident it will do the job. One caveat: per other reviews I have read, the bags give off a gamey, almost wet-dog smell in humid conditions. Not a deal breaker, but something to be aware of. When we took it from the eastern region of the US out west, the smell was barely perceptible (no humidity out west), but once I returned east, there it was again. I was told by customer service this smell is due to the type of down used. I'm going to keep these bags, as they are good performers. My priority is comfort, performance, and light weight. These bags get 5 stars for all 3 of these factors.