Personalized Invincible Techie Dark Products Toddler Long Sleeve T-Shirt. IT invincible techie is a humorous gift design for computer geeks, programmers and IT personnel 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.