Bought these for a relative who is a Postal Carrier. The Large fit his work 9-1/2 shoes well & has prevented falls on ice. Fairly easy on/off. Product well made for the price range. The diamond grip seems to work better on compacted snow that just standard smooth chain. These work! Also is a lot cheaper than having broken hip or arm bones plated & pinned after a hard fall. FYI: Manufacturer has a web site for sizing & other questions a buyer may have.