Personalized Santa Hat Gym Text Toddler Long Sleeve T-Shirt. The word gym with the letter G in the word gym wearing a Santa hat is a funny Christmas gift design for exercise buffs, body builders, trainers, gymnasts and physical education teachers. A classic for Fall, Winter and Spring, these long sleeve toddler t-shirts are sure to be a staple in your child's wardrobe. Whether layered or alone, this t-shirt is soft yet durable enough to stand up to your toddler's playtime demands.