I was able to pick up some merch from this last weekend. Sunday's giveaway promotion were these Knockaround brand sunglasses. I had never heard of the brand until last year when they had a giveaway promotion as well.
The brand seems to focus on low cost glasses (I see a lot on the website for $14). For being low cost, it's pretty good quality. Plastic seems tough. The arms do the breakaway thing to prevent against snapping off. There is a laser etched interlocking SD on the lens (that is impossible for me to photograph).
As far as I can tell, there isn't much difference between this free promotional pair and their regular Fort Knox model. The difference being actually added features like the extra printed logos and the etched logo.
This is one of my favorite giveaways and I didn't think it would be. I think I would like it even if it wasn't brown.