Rosemary6NT Hi Rosemary, I think the mechanism is gas lift technology - a bit like in an office chair. You can adjust the amount of ‘give’ going down and ‘lift’ going up to suit your weight. I can’t stand from a low chair at all. My arms are much weaker than my legs, but both are poor. This cushion helps a great deal. I know some people don’t like purchasing from Amazon, but a good point is that you can send things back very easily if they don’t fit the bill… so I would say to give it a go.
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