I had previously read about cracked knee pads in the cold, but I didn't think it would be an issue in the jacket due to less flex needed in those particular areas. I keep my gear in the house or a heated area at work when commuting, so breaking the pads through normal use shouldn't really be an issue for me. I agree that body heat should help, but I noticed the other night in the 30's that the pads were considerably stiffer when I got home than when I put the jacket on and that was after one hour. I don't expect them to be exactly the same at 30 degrees as they were at 75, but I do expect them to provide the same level of protection in the event of a fall. I don't think that's an unreasonable expectation. If they crack due to flex when cold, I wonder if it would shatter on impact from brittleness in the same conditions. I think I'll contact Klim to see if they have any data about d30 performance at lower temperatures. The last thing I want to do is wonder if something I bought primarily for protection only works in a fairly limited temperature range.