On Facebook, Morinaga touts its Mt. Rainier production method, which includes UHT sterilization and use of sterile cups. This makes sense if the point is to show how safe the products are, but they claim it to be the secret behind the chilled milk-coffee's good taste. Mt. Rainier coffee does taste good, but I assume there are other production secrets. UHT is standard and is thought of as a the method which has the least practical negative effect on taste. Premium milks use more expensive low temperature pasteurization methods to achieve what they consider to be a superior taste. Nothing wrong with this product, but this explanation sounds a bit off. 森永 マウントレーニア
Photo is a web capture for explanatory purposes, copyright belongs to the company.