Using proper grammar is essential. Express your appreciation for proper use of the words there, their, and they're with this awesome funny teacher appreciation t-shirt. Bold typographic style gets the point across with maximum impact. Unisex Shirt for Men or Women: an everyday favorite. 100% ring-spun cotton (Sport grey is 90% ring-spun cotton+ 10% polyester, Dark heather is 65% polyester+ 35% cotton, Fabric weight: 4.5 oz/y² (153 g/m²). Pre-shrunk for extra durability