Why? Well, the basic principle of memory foam is your weight compresses the foam and allows it to mold to the shape of your body so you are cushioned where you need it – nothing wrong with that.

However, it’s different with office chairs because we weren’t designed to sit for hours on end, so we move around in the chair because our body maybe sends a signal highlighting our back is uncomfortable and needs to change position.

In the meantime, the memory foam has molded to your initial position and then you move, as a result your body weight distribution changes so the foam needs to decompress and recompress to a new position, and that takes time because memory foam has a real slow reaction time as it slowly readjusts to your new posture.

With modern high-quality polyurethane foams not only is the response time far quicker, it also gives excellent, comfortable support as well meaning as you change so does it by reacting rapidly without loss of support. What’s more it won’t flatten with repeated use always maintaining its original shape.

It’s for this reason I suggest you avoid memory foam in office chairs and stick with high quality polyurethane filled seat pads and backs which are the standard with most quality manufacturers.