1. These are the lightest running shoes ever worn. 2. Although the soles appear thin, they never wear out. Orthopaedists should definitely pay attention to this material for joint replacement. 3 I don't like it - for some reason it's very difficult to order them, especially my size is 10.5. I even went to the Saucony website and they had a very limited number of sizes. The demand far exceeds their production. Can someone at Saucony explain why production didn't stick to a product that would definitely raise more capital?