They're not really built for warmth. They're perfect for me in the range down to about 25*F, at which point my hands start to get a bit cold. I don't think I'd want to wear them below 20 without liners. They're about the same weight as the mechanic's gloves I've been using in that range. I generally shift to warmer gloves then, but by then I'm also wearing a winter jacket with reflective arm stripes so I don't really care if the gloves are bright at that point.