As you can see, under armour is one of the most amazing sunglasses producers in the world, its sunglasses are very nice,especially those that are design for sports use. To be honest, there are many options for you from which to choose.Such as Walmart, Bergdorf Goodman,etc, just some luxury shopping centers. Also, some websites have got them on sale, such as Ebay and Alibaba.
If you take the quality of the under armor sunglasses into consideration, you could go to the amazon to have a search. The quality there is proved. And there may be many types of different colors for you to choose from. You could also go to other online stores to have a look, like http://www.framesdirect.com/framesfc/Under_Armour-lamjti-slb-l.html.
Well, they are very famous in the world for the polarized lenses are tough against impact and designed to present a non-distorted, glare-free range of vision. Also, they are lightweight, and have contoured designs. First, you should know that they are made in china. Also, this is also the most common and best way which is used to spot the fake ones. Generally speaking, if they are authentic, you will find the label which should be written with the words "made in china". You can buy them at http://www.underarmour.com/shop/us/en/mens/accessories/eyewear. in this place, they have different types which you can choose from. And they can just cost about 100 dollars. Besides, they are UV protected, so they can protect you from the UV rays and sunlight. Anyway, just have a try.