Even the worlds best athletes start out small, so Oakley engineered a youth frame thats big on protection. The look is pure Oakley and the science is High Definition Optics (HDO), a collection of technologies that maximize clarity. Pure Plutonitelenses filter out 100% of all UVA, UVB and UVC, and combined with this durable O Matter frame, they meet ANSI standards for impact resistance. The XS? stands for extra small,? so these sunglasses are for the young and reckless.