Personalized Swimming Rocks Light T-Shirt. Swimming Rocks text with three happy, dancing rocks with swim goggles and flippers is a humorous gift design for swimmers and divers during pool and swim team season. 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.