You will want to make sure you get a goalie jock and not a player jock. Goalie jocks have extra protection and extra padding to protect you. For younger goalies, just a goalie jock should be fine, but for my older goalies (14 and up), I recommend that you wear a player cup under your goalie jock for two reasons. 

 

Reason #1: 

The player cup will help to keep everything in the right places. 

 

Reason #2: 

Extra protection 

 

Here is one piece of equipment that you will not want to try to save money on, go for the best, and make sure it fits.