FORCEFLEX is engineered with patented technologies to create fexible high performance eye wear. Our I-form frames perfectly adjust to any head size, eliminating pressure points and providing maximum comfort . They also provide the ultimate protection, exceeding the highest ballistic standards,including military grade (ML-PRF-31013).EN 166 Distortion free lenses , with UVA and UVB protection. anti fog and scratch FORCEFLEX FF3 spectacle clear K & N Rated. FORCEFLEX FF3/JSP, Made in ENGLAND, 50pcs/crt