I think I bought the first pair about this timevibramfivefingersSprint last year and the kso's a couple of months later. I wore them all through the winter, not to work but just about everywhere else. The only weather I didn't take them out in was wet snow and puddles and long outdoor outings. I'm not a winter sportsman so it wasn't a problem. I did get caught a couple of times with soaked, frozen feet. Not fun.Kevin also posted in the forum that both of his black KSOs weigh a full ounce less than when he bought them due to the lost rubber from wear-and-tear.My wife is about newvibram fivefingersweeks pregnant and has had a bit of foot swelling, so I've been trying to figure out if VFFs would be a good way to make her feet more comfortable (And thus be the tipping point to get her to finally get some!). Thus, I asked Kevin if Lori had experienced any of the same, but she hadn't (You're lucky, Lori!).