I have a pair and they don't have too much insulation. On rides as low as 20s with a mid weight wool sock they have been toasty but I would not go much lower. If it is any colder then I am usually riding inside anyway. The shoes are not as bulky as some others so I suppose you could throw a bootie over if you needed to. Overall they are best for late fall, early spring, or milder winter rides.Pedalfaraway said:anyone use these? Can you ride with these and just warm socks in temps below freezing?? Are there other winter shoes that you would suggest?