I would think that the plastic adirondack type chairs would work nicely. You can get them about anywhere...Target, Walmart, Home Depot or Lowes, among others.

I would think the plastic adirondack would work also but most of them have seats that are way too far out the water. It would be preferable to have a seat that is under 9" in height...

Does anyone know if the plastic adirondacks will float in 6-9" of water? Assuming there isn't a butt in it?

Here is what ya need!

http://www.aquasupercenter.com/products/Pool-Party-The-Raft-36%22-Depth-Floating-Table-and-4-Chairs-w/-7.5%27-Umbrella~36762.html?CAWELAID=327060473

Did anyone ever find lounge chairs that work in a tanning ledge/shelf? Saw this post and I haven't had any luck yet. Can you get the adirondack chairs as lounge chairs? Haven't seen them at Lowes, etc....

I was looking all over for some and stumbled across some nice looking plastic adirondack chairs at Home Depot. They came in a few colors and were $14. They sit nicely on our baja shelf which is 18", about 6" of the chair is underwater so these may work for your shelf. I wanted plastic vs metal and they have been a great find.

Ledge Loungers. But they are PRICEY!

http://ledgeloungers.com/

$660? Are they crazy?

PoolSpaHow.com sells quite a few submersible chairs. Not sure if it's exactly what you're looking for or not.

stupid48 - if you are still on the market, our products are designed for in water use on baja shelves! They are made with high quality materials to withstand sun, weather, water, and chemicals of the pool environment. Check us out: ledgeloungers.com

We just purchased 2 aluminum bottom low seat chairs at Sam's club. They are the Bahama Joe's, or something like that. I like them because they are foldable so that I can put them under our cover patio when we are done for the day and they are very lightweight but will sit on the shelf. They were 26.99 each.