I got Pearl Izumi Inferno gloves last winter, and I have yet to find a temperature that they don't work at. In fact, my hands have been sweating when the temp was as low as 20F. They work equally well on the mtb and the road bike, because the first two fingers are separated, and the other two are snuggled together. No annoying seams, either. I stick them over the heat vent for a couple of minutes to warm the lining before I put them on, and I never notice the cold.