I give the Riva's 4 stars only because during their break in period I developed a small blister on my left heel. My right foot was perfectly fine and this could be due to a slight defect in the pair I received. I wore them the first few times on dog walks that lasted about 20min each and then on a longer walk with heavier socks - as my blister has almost healed and the shoes have broken in it looks like whatever was causing the blister is gone.

I almost considered returning them but really liked the style, the fit (like a glove), Vibram sole, and the Event breathable waterproof fabric so I gave them my due diligence and waited to see what they were like after breaking in and am glad I did as the pros outweigh the cons.

The traction on the trails or dirt is awesome - on my dog walks there is a section that is off road and the Riva's track very well and are warm and keep my feet dry in rain and puddles.

I do recommend these to others but direct you to REI to try them on before you buy at Amazon. They are $140 at REI which is higher than other similar brands but my size at Amazon was $100 so a much better deal.

Good luck and enjoy!