We are using the Prevalon turning system for our 90-year-old mom. She is bedridden & has no fat over her sacrum. She often complains that her derriere is sore, and of course bed sores are a concern as well.
The wedges that come with the system are too long to accomplish the sacral off-loading illustrated in the video, as she is a very small person at under 5 feet tall. But they're still very useful; we tuck them underneath her on a "whatever works" basis, and they do provide some comfort. The wedge that goes under the thighs seems to keep her from sliding down in the bed as quickly when the head is elevated.
The Prevalon glide sheet makes it easy for one person to slide the wedges (as well as plain old pillows) underneath her without log-rolling her. (A bonus, as she is very independent, even with dementia, and emphatically objects to being handled unless it's on her own terms.) I am not as strong as I once was. Nevertheless, once the glide sheet is properly positioned under her, I am able to use it to position her in the bed by myself. I do have to have help re-positioning the glide sheet every 24-36 hours. It is not anchored to the bed, and the same friction-free properties that make it such a great tool also make it susceptible to sliding down and around on the bed. A stronger person caring for a patient who was able to assist a bit, possibly by holding onto the bed rail after being rolled up on their side, might be able to re-position the sheet on their own. (Though I know that the manufacturer does not recommend that for safety reasons.)
The Depends underwear that Mom wore for years is now uncomfortable, so she is going completely "commando". We use organic cotton baby crib pads under her bottom (from Amazon) and tuck a Tena pad between her legs. This makes her more comfortable, and also extends the life of the Prevalon climate-controlled pads that are used between the patient and the glide sheet.
This system has made caregiving easier and more tolerable for both us and our mom.