I have wide feet and read virtually all of the reviews on this product.  Everyone raved about them, but I couldn't wear them more than two hours before I had to take them off.  They are well designed except that the "one fit all" size seemed to be pretty narrow.  Additionally, the back of the shoe rides high on the heel, requiring the use of Mole Skin or another product to prevent blisters.  I returned them and decided to alert those with wide feet to try a pair before you order them.  The problem was resolved (for me) when I tried the Keen "Brixen Lo Waterproof" model.  I wear 11.5 and purchased 12's which were perfect.  Highly recommend them and they are available on Amazon.  Usual excellent return policy.