Professional development is part of the job. Taking it seriously? That's another story. This playful design is made for educators who appreciate a good laugh. A fun, tongue-in-cheek design for teachers who have attended enough PD to earn a PhD in sitting through it. You can choose between the Gildan - Heavy Cotton™ 100% Cotton Short Sleeve T-Shirt. It is 100% pre-shrunk cotton and a soft, midweight t-shirt, the Gildan Softstyle® T-Shirt or the Gildan Softstyle® V-neck tshirt , which are both a lighter weight shirt and are made with 100% ring spun US cotton. All apparel is unisex sizing unless otherwise specified. Please see our sizing page for measurement information. Heather Purple is 65/35 polyester/cotton