Heather Gray: 80% Cotton, 20% Polyester; Other Colors: 100% Cotton Care Instructions: Machine Wash Closure Type: Pull On Sleeve Type: Short Sleeve About this item Sketch of a mathematical function graph. The most famous and most used algebraic equation graphs with funny expressions. Sketch of a mathematical function graph. The most famous and most used algebraic equation graphs with funny expressions. Perfect gift for high school students, college teachers and students, geeks and math geek friends and relatives. This clever design will surprise you by paying attention to your friends. This design with unique stick figures dancing in math graph shapes is perfect for mathematicians, students, and teachers. Perfect as a birthday, anniversary, or teacher's day gift. This unique artwork will appeal to everyone who celebrates the beauty and fun of mathematics. The best choice for school events, math contests and special days. Size: S