Sunny days at the lake and bright mornings in the mountains don't hurt your eyes thanks to the Julbo Tensing M Sunglasses. The Spectron 4 lenses transmit 5% of visible light so you can enjoy the scenery under blue skies. Julbo recommends these lenses for sunny days outdoors but not for driving. Julbo added a flash finish and an anti reflective coating to the lens for a mirrored effect that improves filtration, reduces eyestrain, and eliminates interference glare. The lightweight polypropylene frame has a bi injected construction where the exterior is rigid and solid to withstand abrasion and the interior is soft for maximum comfort at all contact points. Julbo gave these glacier glasses a wrap around shape and the frame also floats which makes these great for high altitudes or on the lake. Proposition 65 Warning for California Consumers: This product contains chemicals known to the State of California to cause cancer andor birth defects or other reproductive harm.