This BackJoy Core (the one with the polyester fiber covering) tends to be more flexible than the Posture Plus model, and in general, it works better in a harder seat than a softer seat. The BackJoy Posture Plus (the one with a polyurethane covering) tends to retain its shape better and therefore works better in a cushioned chair. Determine which kind of seat you’ll be sitting in most of the time and choose the BackJoy that performs best under those conditions: you’ll get more of the intended effect.
..More
This BackJoy Core (the one with the polyester fiber covering) tends to be more flexible than the Posture Plus model, and in general, it works better in a harder seat than a softer seat. The BackJoy Posture Plus (the one with a polyurethane covering) tends to retain its shape better and therefore works better in a cushioned chair. Determine which kind of seat you’ll be sitting in most of the time and choose the BackJoy that performs best under those conditions: you’ll get more of the intended effect. ..More