It took me ~2 dozen pair to find the right sandal

Two dozen pair???!!! grin Barry you are a die-hard! wink I guess its terrain. Sticks found their way into my feet too often to continue chancing getting stabbed. Mosty juniper sticks. In the desert it was sharp rocks getting under my foot. I'm aware some sandals are much more enclosed than what I hike in (Nike Strap Runners at present) but there is a point that they become shoes and not sandals. I still keep them in/on my pack for spares or for wading.
Never wore socks with them.
paul, texas KD5IVP