Optimal Fit, Breathing Resistance and Filtration. Minimizes Lens Fogging due to seal created. Fully adjustable strap to achieve the optimal fit & comfort. Goggle Certified to AS/NZS1337.1:2010. Anti-Fog. Anti-Scratch, Medium Impact Protection Lens. Fully adjustable strap to achieve the optimal fit & comfort. Can be worn over most prescription eyewear. 5.5 base curve, one piece lens offers unobstructed viewing