My wife loves this ball. She likes its color and thinks it is very sturdy. I, however, think that we have a defective ball. No matter how de/inflated I make the ball, it never becomes a sphere. With the help of a bicycle pump and the enclosed plastic tip I was able to inflate the ball to its recommended 65cm ( I used a tailors tape to measure), but I was far from round. The ball has three 'lobes'. I've read great things about GoFit, so this is probably an anomaly. I would have returned, but my wife doesn't mind.