The Bobster MX3-100BK off road goggle that is for the serious rider, especially those who wear prescription lenses. A removable RX insert allows subtle, enhanced vision without sacrificing style. Set in a black gloss frame, the 3 layer foam (Neoprene, Open Cell Foam & Fleece) prevent dusts and dirt from obstructing clarity. The adjustable strap come standard with silicone non slip strips to keep your goggle in place during the roughest of rides. *Note: While the item comes with an Rx insert, the prescription needs to be completed by the purchaser's own doctor, as Safety Glasses USA does not offer this service. *Please note that while these glasses would presumably pass ANSI Z87.1-2010 standards, they are NOT certified, and are therefore not endorsed as safety eyewear by Safety Glasses USA.