Personalized Blue Mechanical Engineer Toddler Long Sleeve T-Shirt. Mechanical Engineer text against a light gear background is a unique gift design for your favorite engineer at birthdays, holidays and graduation. 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.