Loading... Please wait...Pouch Shorts
Small/Medium = 28 - 34" waist
Large/Extra Large = 34" - 38" waist
Jocks, Open Crotch/Zip Thru Shorts and Play Chaps
Small = 30" - 31" waist
Medium = 32" - 34" waist
Large = 35" - 37" waist
Extra Large = 38" - 40" waist
Wrestling Singlets
Small = 35" - 37" chest
Medium = 38" - 40" chest
Large = 42" - 44" chest
Extra Large = 46" - 48" chest
Tank Top
Small/Medium = 36 - 42" chest
Large/Extra Large = 44 - 48" chest
Premium Rubber

Proper cockring sizing is extremely important. Too tight can mean injuries, too loose means it won't be effective.
To measure, get a piece of string or ribbon and wrap it around the base of your cock when you're hard; you need to measure at the base of your penis and behind your balls.
Then divide the length by 3. This will give you your diameter measurement.