I was looking for a roller that would hold its shape and be of really decent quality. This roller does exactly that. Previously I had one of the cheaper rolls, a white one, which eventually squashed into more of an oval roll - not helpful in my pilates and yoga moves! This green roll was recommended by my Pilates teacher, and is quite dense and hard, which means it keeps its shape. I've really noticed a good difference in my exercises since I've bought it. My fitness has improved, as the roll makes me hold my abs in while I am laying on it. The old roll let me cheat, as the squashed oval shape would stay anchored to the floor! But this green one will roll away if I don't hold my abs and posture while I'm using it! Also, because of its proper circle shape, I find my back 'clicks' at times and does feel better for it. The roll really is a big improvement over the cheap one I bought first. I would recommend paying the extra for this roll. It is an excellent, quality product.