Quote Originally Posted by Seajay View Post
I've had the best luck with these. Not sure about the air circulation for these, specifically. They don't SEEM to require it. I let them get started warming, then put my feet in the shoes.
I used the toe warmer version of these and they seemed to work for the most part. My shoes have a LOT of vents and as I don't have booties I just had toe covers on. I did notice my toes starting to get cold on downhills, but aside from going downhill they didn't do too badly. I did not try the plastic bread bag option, I think my shoes are probably a little too small for that.

I think I might want to try the full length foot warmer until I can afford full shoe covers. The rest of my body was nice and warm, though I think for any colder temperatures I want to wear my full Gore "head covering" under my Smartwool balaclava. It was ok at 35 degrees but my head was a bit cool.