Three buttons down the front of the shirt allow for a level of breathability that will keep you warm without overheating. For extended sizes, search for style# 2064188. 100% cotton; jersey knit; weight: 6.75 oz. Snug rib-knit collar and cuffs. Side-seamed construction to minimize twisting. Left chest pocket. Tagless label for an extra level of comfort. Machine wash. Imported.