Personalized Sweaty Gym Teacher T-Shirt. Gym Teacher, if there is no sweat, you're not working hard with water drops is a a humorous design physical education teachers at back to school, birthdays, holidays and graduation. 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.