These Bolle 40145 SENTINEL glasses provide a high level of ballistic protection. Their high-performance polycarbonate smoke lenses guard against impacts as well as glare, meeting STANAG 2920 standards. ESP lens technology filters out 99.99 percent of UVA and UVB radiation to protect the eyes, and also prevents transmission of most blue light for further protection. The lenses also feature anti-scratch, anti-fog coatings applied to each side to orevent damage and preserve visibility. The flexible temples allow the sunglasses to fit a wide variety of face shapes. The adjustable bridge and temples are non-slip to provide a secure fit.