nCase Back Cover for Sony ST25i Xperia U (Clear)

It's a good product. Cut-out window is accurate and the phone neatly fits in to the cover. But it turns yellow after a few weeks and that is really exasperating. It could be due to the radiation from the battery but whatever maybe the reason this TPU thing reacts to the heat and becomes pigmented. Arrest the cause of yellowing, then it will be a perfect product.