Awkward conversation advice

I'm looking for advice on how to breach the subject of condom size with my fwb. He's a great guy and great in bed, but he is a bit on the thin side, which is perfect for me. However, the condoms he uses are too wide.He always has trouble getting enough sensation to finish, and they're very loose on him, to the point where they could accidentally slide off. I'd rather not have to go spelunking for a loose condom if I can help it.I know there are slim fit condoms that would probably fit better and make things more enjoyable for both of us, but I don't know how to suggest that to him. I'm worried he might take it the wrong way.