V2 Technology Mechanical Stretch with Teflon stain repellent finish in the sleeves and collar No curl collar with integrated collar stay Running gusseted construction under the arm The V2 Pro Performance Shirt is a hybrid design developed, now in short sleeve, with input from Law Enforcement and Tactical Operators that combines our best selling Performance Polo with our V2 shirt. The result is a new lightweight base layer that is perfect for use with an external carrier.