These are nice for fall rides but I don't think they are going to be warm enough for winter rides in 30 degree temps. They have a lycra type material on the sides of the legs with more of a knit "fleece" material on the front of the legs. They chamois is nice and the waistband is comfortable. They seem to fit true to size but my only complaint is with the leg grippers at the bottom. They are tight which is nice the but the elastic rubber bands pull at the skin when riding.