Although they appear thick, they aren't as soft as I expected. These sandals are too narrow and hard. The one on the right is even narrower than the one on the left. I don't know what the holes are for. carry water? But they are not at the lowest point of the sandal, and your feet push in to close these holes when you wear them. Water can easily drain through the front and sides without going through these openings. These holes only make it easier for dirt and grit to get in if you do a lot of outdoor walking in these sandals. And it will be difficult for you to clean them when dirt gets into these holes.