6.8 oz. (US), 11.4 oz/Lyd (CA),100% Peruvian Pima cotton; Grey Heather is 90/10 cotton/polyester; Comfort of luxurious Pima cotton; Three Dura-Pearl™ button placket; Durable double-needle stitching on hem; Shape-keeping DuPont™ Lycra® ribbed cuffs; Additional yarn in collar & cuffs for a neater appearance and greater durability;