Personalized Coolest Environmental Engineer Toddler Long Sleeve T-Shirt. The world's coolest environmental engineer with a snowman wearing a hardhat and holding the earth is a humorous gift design for engineers and college students at birthdays and holidays. 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.