The professional jersey is designed to be worn with a vest. The Lycra main body wicks away perspiration, keeping your core cool on those hot summer days with your loaded out HD vest on. The zippered neck makes it easy to put on and remove, and offers neck protection. Reinforced elbows and extensive padding makes you more comfortable when crawling around on rocks, sticks, and thorns.
The BT Paintball Design Pro Jersey is newer, so it should be commonly available, both new and used. Check out the Places to Buy links below for places to purchase it new.