Adventure sunglasses that stay
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I have some ideas on sports sunglasses, made specifically for the adventure racers. They would be used by rock climbers, eco-challengers, obstacle coursers, etc.
They are somewhat like goggles, except without the tight feeling around the head. The tightness could be adjusted just before entering any water. The lenses have a UV protection agent to them.
Draw-back - wear and tear. Due to the type of sport done, the sun glasses may not make but one trip, but then what sunglasses make the whole trip without a scratch or two. - Like scars, shows you finished more than strong.