I bought this bag because most sleeping bags are sized for vegetarians with no meat on their bones. I am 6'1 and quite solidly built, and this bag is the perfect size for me. The removable flannel liner is very comfortable, and I have tried sleeping in the bag without, with the liner by itself without the bag, and with them both combined. This versatility allows the bag to be used in varied temperature ranges. Moreover, the bag is large enough that I can slip my Therma-rest Luxury Map XL self inflating air cushion between the bottom of the bag and the flannel liner. There is still just enough room for me to be zipped up snugly.
This is a great sleeping bag, I haven't tried it in it's lowest degree rating but I have used it in the higher degree rating and I LOVE it. I love the inside fleece blanket for extra warmth and comfort. I love the big size so I have plenty of room. It is everything I was looking for in a sleeping bag.