The best sunglasses for outdoors must equip the best ability of radiation protection especially the Anti-ultraviolet ability. The best lenses would achieve 98% even 100% Anti-ultraviolet function. Additionally, the glasses frame is important; the durable and elastic material will be the best choice. There's nonmetal and metal material for you, the high-end sunglasses frame usually will be aluminum magnesium alloy even titanium alloy. The comfort level and abrasion resistance of them will be the best, while they are fashionable and cool. Besides, the style and color of sunglasses are various; you can find one to meet your interesting. Finally, the quality compliance and the service after sales will need your attention. There's some online shop for you to choose, please find bellows, http://www.glassesusa.com/, http://www.glassesshop.com/
http://www.goggles4u.com/, and the best one which I prefer is firmoo.
Many people may prefer the sunglasses with big brand. However, I think the sunglasses from the visionworks are also good. Just pick the ones with dark series lenses which may have good transmission ability or the reflecting ability. And choose the right appearance that makes you look cool or beautiful. The most suitable one is the best one for the outdoor activities.
If you want to wear a pair of sunglasses to go to outdoors, I suggest that you should wear the polarized sunglasses. polarized sunglasses are very popular with the people who work outdoor. Because of the special design and perfect material, Polarized lenses can block 100% of glare. In this way, they help reduce eyestrain. Besides, Polarized lenses will also help enhance an image and its color so that your surrounding will have bolder and brighter colors and look clearer. In other words, they are very useful and can make a difference. Anyway, you can just buy ones and have a try.