Pineapples built from tightly packed pi symbols give Pi Napple Red Button Up Shirt its whole personality. Each fruit is outlined with crisp green leaves, while oversized red pi characters and sketchy tropical leaf shapes fill the background for a pattern that feels clever without losing the island-shirt vibe. Design by Nathan keeps the repeating print sharp, playful, and instantly readable from collar to pocket.Product Details Made with Geeknit, our ultra-soft, lightweight, and moisture-wicking fabric designed for all day long comfort Branded buttons Regulaxed fit Continuous design between the left and right side of the shirt and the optional pocket Created with eco-friendly inks that are environmentally friendly Licensed art with most purchases benefiting the artist directly Proceeds from every purchase benefits charity The Hawaiian shirt, also known as a camp collar, has a Cuban collar characterized by a flat, open notch neckline, which is best for laid-back settings. The Button Down has a more traditional button up closure that has a top button and a collar that stands upright and has a more formal appearance.