Get your MaThCliX® Merch! “I Heart MaThCliX” All t-shirts are black cotton and available in youth sizes through adult. We thank you for your contribution to helping students excel in MaTh! Contact Us E-mail [email protected] ORDER NOW: Include shirt size (Youth: XS, S, M, L, XL OR Adult: XS, S, M, L, XL, 2XL, 3XL) , and shipping address. Cost is $20 and this includes shipping. After submitting order, you can pay using the donate button to the left.