Probably the most bad ass pair of motorcycle bifocal sunglasses on the planet. The Horsepower II is built for speed. Built in foam cushion seals out wind dust and debris. And now you can easily see your GPS and read menus at your favorite biker hangout. Available in 1.50, 2.00, 2.50, 3.00. General rule of thumb is to go up .25 if you are an X.25 power.