QR Code, Short-Sleeve Unisex T-Shirt

How much data is there behind this QR code? What do they know about me? What are they going to do with all that information? And how will that be affecting me in the future? Product Details This t-shirt is everything you've dreamed of and more. It feels soft and lightweight, with the right amount of stretch. It's comfortable and flattering for both men and women. • 100% combed and ring-spun cotton (heather colors contain polyester) • Fabric weight: 4.2 oz (142 g/m2) • Shoulder-to-shoulder taping • Side-seamed Model is wearing a size M. He's 6.2 feet (190 cm) tall, chest circumference 37.7" (96 cm), waist circumference 33.4" (85 cm). Size guide   S M L XL 2XL Length (inches) 28 29 30 31 32 Width (inches) 18 20 22 24 26