Back before they had all the fancy gym workout apparel it was just good old fashion 100% cotton t-shirts. You put on the cleanest shirt you could find and hauled off to the gym with your buddies. It wasn't about dressing to impress.
Your gym reputation came from your work ethic.
If you're serious about training you understand the need for a rugged shirt. It's going to get soaked in sweat, chalk dust, and blood on it... and maybe not wash it for a day or two. But who cares?! You're working!
To top it off... When everyone sees you with the METROFLEX LOGO. They know you mean business when you step into the gym.