4mm is better suited for a woman than a man. The ring is nice enough for the bucks but when you put it on a man's finger it gets a little lost. I was happy with the over all look except for the width so returned and bought a wider band elsewhere. Amazon did not offer the width I wanted in white gold with the comfort fit.

Amazon was very accomadint on the return. Also make sure when you do buy a band go for the comfort fit it feels a lot better wearing.