My wife picked me up a pair of these things last week and I rode in with them today.
they are the Heat Sox brand she got from Dunhams Sporting Goods.
Boy are these things tight. I wear a size 11.5 shoe so she got me the XL size (supposedly for sizes 11-13) but man did I have a time getting them on. Once I got them on the footbed area is rather loose so I'm guessing they make the legging part tight to hold up the "D" battery.
They have a switch on them for Hi, Low, and Off settings.
I rode for 1 hour today with them on hi and can't really say that I noticed much of a difference at all.
I usually ride with a sock liner and think wool sock (one or two pair) and it seemed that combination was warmer than these battery socks with a sock liner.
Anyone have experiencve with these things? Are they supposed to produce heat or just keep the chill out? I felt no heat in the toebox heating element in them... maybe i was expecting too much from such a thing. Or maybe they are just bad and I should exchange them.