I debated for a while about the thickness I wanted for my ring. I was thinking my hands may be to "thin" for a big fat 6mm ring. Well, I was JUST about to order a 4mm, and decided to go with the six. I got this ring in the mail, and it was perfect!! The sizing is exactly what I had fitted myself for at a local department store's jewelery section. The quality of this ring is amazing, and the weight is awesome! I wanted a ring that I could tell that I was wearing, and this is it. The comfort fit is the best option to go with, in my opinion. It has rounded edges, and is very comfy. Highly Recommended!