Authorized dealer-warranty is valid. “The Golf Swing Shirt” is revolutionizing the way golfers learn, practice, and play golf. Great ball striking usually happens on the FIRST DAY, instead of years of painful trial and error. You will groove a reliable and repeatable golf swing that works day in and day out. Brand-new authentic merchandise. Take a look at all of our Golf Swing Shirt listings! Pick your size based on weight: size 2 70-110 lbs, 3 110-150 lbs, 4 150-180 lbs, 5 180-210 lbs, 6 210-240 lbs, 7 240-280 lbs.