The final plastic model is the M Frame. This single lens pair is used in sports activites. A standard hinge frame
model is available as well as a Pro version with no hinge. This allows for a more secure fit, at the expense of an
bulky frame. The lens comes in 4 different shapes and all can be swapped for a different look or color.
The Heater lense has a swept back look with rounded edges. The Strike has a cut of and boxy look. The Sweep has a very
sharp angle leading backwards, and the Hybrid is a combination of the Heater and Strike.