These chairs are perfect!!! I have about a 15 1/2” deep tanning ledge. Although the description says up to 12”, I gave this is a chance, because I liked the idea of not having to have chairs on the ledge permanently. They work excellent! The front end does float up a bit when in the water at 15”, but serves its purpose and I couldn’t be more happy. I also love how comfortable they are both inside and outside the water!