When a home health nurse, physical therapist, or doctor flags pressure sore risk and tells you to get "a proper pressure relief cushion," they're not talking about foam from a drugstore. They're referring to clinical-specification equipment — and most caregivers don't know what that means until they've already bought the wrong thing twice.
The Zero Gel Ultima is built to the same depth specification used in professional care settings. If a healthcare professional has raised the alarm, this is the cushion that matches what they have in mind.