Sunglasses are a must anytime of year, but especially in the summer when we spend so much time outdoors. If you run, hike, bike, or spend time on the water, you need a pair that will stay on your face even if you're sweaty, wearing sunscreen, or it's windy.
I found a line from Bolle called Serpent - it's a wrap around style so they fit snug against your face. They also have non-slip thermogrip material on the ends by your ears that prevents them from slipping off, and the same rubbery material on the nose pads. You can choose to have polarized lenses or not, but all the lenses are made of polycarbonate. This means they are lightweight, thin, offer UV protection, are durable and scratch-resistant.
This Serpent style comes in many different color combinations, so if you don't like the ones shown, you can choose a different variation. While I think most polarized sunglasses are overpriced, but you can get a pair of these from Bolle for under $100.