Horse has "bed sores" how do I prevent them?

Hello All,
Tia has formed "bed sores" from laying down on the hard ground. She naps a lot and shavings and stall mats are not likely since she is in a larger paddock and also a large turnout. I do know that there are doughnut shaped boot-like things used to prevent a horse from getting these sores, I am not sure what they are called though, or where to get them.

She gets the sores on the front of her fetlock joint and on her right elbow (she lays on her left side) She has front shoes on and I believe I've heard the sore on her elbow be called a "shoe sore" before as well.

If anyone knows where to buy these hoof rings or what they are properly called, please let me know.

Thanks,
Horses4Healing

I believe professionals choice makes boots- and they're just called "bed sore boots". And I swear I've seen elbow boots... If I could just find the website..
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Ointment to keep them from getting infected and boots might help, my fiends horse had this issue last year but she found the boots to move around alot, even when snug....

I've heard them called shoe boil boots. They are padded leather rings that also protect the fetlock when the horse lies down.

Here I found them SmartPak has them