Pros: Light weight, great traction, most comfortable outsole of all my running shoes. Cons: The bulge on the back of the shoe rubs the heel at the top of the achilles tendon so hard it rubs off my toe and gives me blisters so bad it bleeds on the back of the shoe...and I was riding in a shopping cart! In the summer I like to wear thin socks, but I can't do that with these shoes, which make them useless.