Smith Optics have got around the problem of how to swap lenses on a frame less design with their clever Pivtlock V90 model. To change tints, simply rotate the earpieces 45 degrees, pull them off and then transfer them and the nose piece to your preferred lens.

It’s as simple and fast as it sounds, it doesn’t require you to touch any lens surfaces, and thus far it’s survived nine months of regular changing without developing any slop in the joint.

Lens swapping aside, the Pivtlock V90 is an excellent pair of sunglasses in its own right. The tapering thickness, one-piece shield-type lens shows only minimal distortion (unlike many bargain makes and models out there), the field of view is broad and expansive with no frame to obscure your vision, and the three-point fit with hydrophobic nose- and earpieces is comfortable and secure.

It’s also very light at just 25g, the rim-free design has good airflow to prevent fogging and your eyes are well protected from wind even at high speed. The moderate 13cm lens width (not including earpieces) makes for a good fit on small- to medium-sized faces, too.

Smith Pivotlock V90