I bought two pairs of this brand of flip flops, men's and womens.  Personally, I have wide feet and the men's work best for my feet.  Ironically, my husband prefers the women's Molokini sandals here.  The moldable flip flop is by far the best concept for people with feet problems. Pop 'em in the oven, stand in them, walk around and soon they are the perfect mold to your feet!  So bottom line........my huband wears the women's and I wear the mens Montrail and we love them.  Highly recommended!