Commuted to work on the bike this morning (since my job doesn't honor MLK Day ) arriving with a frosty reading of 10 degF on the iBike. I was warm enough that I still raised a little bit of perspiration. My toes complained, but only a little. Chemical warmers might solve that, since I'm already wearing wool socks (very good, but cheap from Sam's Club--imho, better than the pair of DeFeet Wool Blaze I got through Performance) and neoprene booties.