As a fullback at the University of Maryland, Plank got tired of having to change out of the sweat-soaked T-shirts worn under his jersey; however, he noticed that his compression shorts worn during practice stayed dry. This inspired him to make a T-shirt using moisture-wicking synthetic fabric. After graduating from the University of Maryland, Plank developed his first prototype of the shirt, which he gave to his Maryland teammates and friends who had gone on to play in the NFL. Plank soon perfected the design creating a new T-shirt built from microfibers that wicked moisture and kept athletes cool, dry, and light. Major competing brands including Nike, Adidas and Reebok would soon follow in Plank's footsteps with their own moisture-wicking apparel. Plank opted to use the British spelling "armour" in the company name because the toll-free vanity number was still available for that version.