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. The frame also floats in water so you can forget about losing this pair in the lake.