Personalized I Heart Gym T-Shirt. I heart gym text with an edgy heart and the word gym wearing sneakers is a fun design for gym and fitness lovers on birthdays, holidays and back to school. Wardrobe essential for looking good, 24/7. 5.0 oz., pre-shrunk 100% cotton. Seamless 1x1 rib collar. Shoulder-to-shoulder taping. Double-needle stitched sleeves, bottom hem and front neck. Note: greys are a cotton/polyester blend.