The Bays from Fortis have been given an update with their new Switch tech, allowing the lenses to darken or lighten based on UV light levels. Light-sensitive molecules in the lenses change and colour when UV rays strike them. The lenses will begin to lighten once away from UV light, returning to their original state. The frames have been given an update too with a new transparent matte brown finish for a subtle style.

Price: £44.99