Personalized 2021 Kiss My Class Goodbye T-Shirt. Kiss My Class Goodbye! Say goodbye to the class of 2021 with a kiss. You know where. Funny gift for your graduate. Everyone loves our Custom T-Shirts! 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.