This shirt displays one of the most elegant expressions for π defined an integral.
It’s more than a number; it’s the area under a curve, the geometry of a circle written in calculus.

A subtle, brainy design for anyone who knows that π is not just a constant — it’s a journey from function to form.

• Made from 100% cotton (fiber blends vary by color)
• Medium-weight fabric for structure and comfort (170–180 g/m²)
• Tubular design with taped neck and shoulders for durability
• Double-stitched sleeves and hem for a clean, long-lasting finish
• Natural and white tones may vary slightly due to fabric characteristics

Each item is printed on demand in order to minimize waste and maximize meaning.
Thanks for supporting thoughtful, math-driven design.

Age restrictions: For adults
EU Warranty: 2 years
Other compliance information: Meets the flammability, lead, cadmium, phthalates and formaldehyde level requirements.

In compliance with the General Product Safety Regulation (GPSR), Oak inc. and SINDEN VENTURES LIMITED ensure that all consumer products offered are safe and meet EU standards. For any product safety related inquiries or concerns, please contact our EU representative at gpsr@sindenventures.com. You can also write to us at 123 Main Street, Anytown, Country or Markou Evgenikou 11, Mesa Geitonia, 4002, Limassol, Cyprus.