The Bombas crew sock is a great sock. Of particular note is the padded heel and the the elastic mid that saves you from the pesky thing slipping down and bunching up. All in all, the sock seems well made and is very comfortable. The color touches are nice as well.
Here is the thing, however. This sock is not unique to other socks that I can purchase at WalMart. And 1, Starter, and others make a sock that is very similar. I have always been on the search for the perfect sock as socks are a vital part of the wardrobe. This sock, however, does not stand out as worth $9 per pair.
HOWEVER - the thing that sets Bombas apart from the big brands is that they are giving back. Being that it is a nice sock - if you have a few extra bucks - Bombas is a good call in that your get some nice socks and help someone without socks at the same time!