Olukai’s are great for a standard flip flop. I also have a pair of slippers from them that are super comfortable. Birkenstocks are my everyday sandals. It does take a couple weeks to get molded to your footbed, but then they are great. As for outdoor sandals, I’ve been wearing Tevas over 20 years (not the same pair), and love the adjustable fit. My husband prefers keens though.