Do Not Differentiate T-Shirt that works for everyone
Versatile, all-inclusive appeal
Our unisex feel and fit work for all genders, all while providing comfortable wear for hours in sizes ranging from S to 2XL.
The Airlume difference + composition
Our Airlume clean cotton is combed and ring-spun for texture and feel unlike any other. Solid colors are made of 100% Airlume cotton; Ath. Heather is made of 90% Airlume cotton, 10% poly; Heather colors are made of 52% Airlume cotton, 48% poly.
Crafted with consciousness + care
Calculus T-Shirts are proudly made in the U.S., and like with all our shirts, are made with 7x less water than average manufacturers, in recycle-friendly facilities that also guarantee zero sweatshop conditions.
Fit for everyone
These Math T-Shirts are no ordinary pieces of clothing. Our side-seamed detailing and expert design banks on a retail fit for clothing that’s true to size.
Welcome to the Proud Line! Our shop is dedicated to providing high-quality goods and a wide variety of products for our customers. You’re sure to find something you love in our shop, whether it’s one of our bestselling items or something new and exciting. We only offer the best products available, and we take pride in ensuring that each and every item is safe for our customers. Thank you for choosing the Proud Line!