John
They all make me hard.

Lance J
That's an excellent question. Jock = elastic strappy thing that holds your stuff in place Cup = hard plastic cover for your stuff Athletic supporter = same as cup Yes they come in different sizes, but not a lot. Look for an athletic supporter that contains an insert slot for the cup. And if you're playing football, do wear a cup.

Lawrence Nelson
I had to buy a support for myself before I had my vasectomy. The doc sent me to the sports store, they were very helpful. When, like me, you have never worn any of the above, it is hard to know what to buy. For the people at the sports store it seemed pretty straight forward.