TPU frame features excellent resistance to cold and heat and provides a perfect facial seal. Special indirect ventilation system located at the top and bottom of frame allow air flow & heat release. Includes a wide adjustable elastic strap with quick release system for secure fit. Optional RX-insert frame secures in the inner side of frame Exceeds ANSI Z87.1 high impact requirements CE EN166 certified CAN/CSA Z94.3-07 MIL-V-43511c ballistic standards *Disclaimer: For overall safety use this product in combination with proper face