I/OS Goggle by Smith is the smallest sized goggle in the I/O family. Designed for smaller faces, this goggle falls higher in the cheekbones, yet still provides the quality vision range Smith goggles are known for. This goggle has interchangeable lens (when purchased, it comes with two lens- one sunny, and one low light) that are very easy to switch out, and fit seamlessly with the frame. It has a flexible, with durable clips to hold the lens in place, with trigger locks on the top, and the side connectors function as other lens locks. The final area to secure the lens is the nose piece. Has an anti fog inner piece that works incredibly well. Would recommend this google to any of my friends.