Oh geeze, let's see... the inside of the band is rounded on the edges and "curves upward" slightly, so the middle of the band is a little tighter than the edges, which allows it to sit on the finger snuggly without biting into my hand when I'm using my hands a lot. Non comfort fit bands I've worn sort of "pinched" sometimes when I worked with my hands and were harder to get on. Plus, with comfort fit, you don't get the "muffin top" on the fingers as much (for me at least). Lol, don't know if that makes sense!
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