Can someone confirm my suspicion that the reason my legs go numb after an hour or so is because I have made the seat too deep and too close to the shape of my backside?
The seat is ground from closed cell foam and covered with vinyl. It has quite a deep concave shape and feels really good and secure for the first half hour, but I think the sides press too firmly on the sides of my backside. A temporary solution of some extra foam just on the bottom to raise me enough to stop this side pressure seems to have solved the problem.
Is this a recognised problem?