The frame is made of PPSU, a type of material which is friendly enough to be made for infant products. Super light in weight and strong resistance to corrosion and heat have made PPSU a lasting and stable glasses material. The temples are made of titanium. Apart from its known advantages of high density and excellent flexibility, titanium is not easily deformed and 40% lighter than most metals. As skin-friendly as it is, it is also extremely durable.