But its not noticeable unless youre actually LOOKING for it--from reading reviews! This little sandal is very comfortable and is perfect when I?m going grocery shopping and have to be on concrete for a couple of hours. It is easy to break 2 or three of these per day. The shoes but somewhat tight at the front. And they do a phenomenal job doing what theyre designed to do. This is my first 1 star review ever. Did not have to use anchors. These are just fine. The sub-woofers on this Bluetooth speaker is wonderful & you can totally feel it. Received these today and was impressed with how many actually come in the box.