XO Athletic established itself in sports protection behind its patented flex-sided XO Pro Cup introduced in 2003. It pioneered the advances found in nearly all athletic cups today, from 2Shot molding for exceptional comfort to colored cups, Teen and PeeWee sizes for proper fit, and a color coding system for simpler shopping navigation at the retail level. It has also raised the bar in sports protection with the innovative XO Heart Shield, developed to help prevent sports related chest injury.