You need to measure your penis correctly, first up. That goes for any man using chastity. The idea is for a snug, comfortable fit which you cannot get out of. Measure your penis flaccid, measure girth, length etc. There is a good website for advising on this that I cannot recall right now, but Google it. It then advises on size. Personally don't spend much on early ones. The smallest you can fit whilst being conformable. If your chastity goes more permanent, like it is for Michael then after 6 to 9 months remeasure as it will shrink, but not permanently. I've tonight got an at home halloween party, so I've two of my regular bulls coming to stay over so it's vital hubby is locked up safely and tight so I can trust that he can't jerk off when he goes to bed in the spare room.
J
Xoxoxo