I want to first off say that this review is not for the above product! About a month ago backcountry offered a product similiar to this: 32North Stabilicers. I bought that product for my father becaues he is always outside during the winter and fell three times last year. He loves the stabilicers!! Everytime I see him, he praises them. The product had about 6 screws on the soles, which work great, according to him. I got him the large because he normally is wearing work boots outside(size 10), and wanted to make sure they would fit around them. Im sure the above product would work fine, but he loves the 32north, so keep your eyes open for them on the website.