James O.wrote a review of Shimano S-Phyre Insulated Shoe Cover on December 1, 2019
Familiarity: I've used it once or twice and have initial impressions
Fit: True to size
Not too bad for low temperature. I rode using them once so far for 3 hours in 40 degrees and got cold feet as the temps dropped toward the end of the ride. The shoes I had underneath are well ventilated though so maybe I will try again with a less ventilated shoe.