I have some and I like them. Good to about 35F for me in humid NE Florida, but once I get rolling, my legs warm up and I am good. I also have the same model leg warmers that I use more often, and they are good to about 40F...but save your funds for REI for something else. I generally find you can get this stuff on Amazon much cheaper. I got a PI thermal jersey that REI wanted $110 for on Amazon for $50. Same for PI leg warmers, REI $50, Amazon for $30.