Men's 100% Microfiber Math Equations Novelty Tie Necktie This one's for you, math nerds. Our Math Equations Tie features tons of equations written in atop a solid background. Perfect for math teachers! Regular, skinny, and extra long length available! Select size from dropdown menu for exact dimensions. Made of 100% Premium Microfiber Neck Size: 14.0'" - 19.0" SATISFACTION GUARANTEED - Your satisfaction is 100% guaranteed. We offer a 30-day money-back guarantee and phone, email, and live chat support are available on our website!