The Canon Slim Fit Crew features a heavy, thermal-like fabrication. Designed with warmth and stretch in mind, this cold-weather essential features a slim fit, long sleeves, and self-crew neckband. This shirt is designed in 6.3 oz. Heavy Heather Rib, creating a Heather Grey hue that’s perfect for your winter wardrobe. Heavy Heather Rib, 6.3 Oz.94% Cotton, 6% Elastane. Imported.