+1 on Arrowhead. As long as you aren't worried about a little more bulk. I have the 25 degree full length New River and the 25 degree 3/4 length Jarbidge. Either one works in temps over 70 degrees for me and stacking them together I have been down to 15 degrees and was very warm. I plan to venture down to lower temps using these. On top I am using two down sleeping bags, one inside the other. Sometimes it's too hot!