The difference between comfort fit and standard fit lies on how the inner side of your ring is made. Standard fit bands have a flat band interior. That means that the ring is touching the skin of your finger from edge to edge. The diameter of your ring at the edge is exactly the same as the diameter when taken at the center. This kind of fit has been used throughout centuries and is the more traditional fit.
Comfort fit has the inner side of your ring rounded off on each side. This makes the diameter of the edge of your ring is smaller than the diameter of the center of your ring. Because the ring is beveled/chamfered on the inside, some suggest to go half a sizer larger for comfort fit bands while some suggest to stick with your true size. This can be quite confusing for sure!
Despite these, comfort fit wedding bands still come out to be the better option. For one, the name itself explains why it is a better choice – it is comfort fitting. A band with comfort fit feels far more comfortable than the standard fit because of that rounded edge. It is easier to put on a comfort fit ring through big knuckles and big fingers and it doesn’t have to be expensive because of the extra metal that needs to be used to round of the interior. Lightweight metals like titanium, ceramic and carbon fiber are very affordable and are perfect for comfort fit wedding bands.