Shirt: robot shirt ,funny t-shirts SIZE ARMPIT TO ARMPIT COLLAR TO BOTTOM Adult S 17" - 18" 26" - 27" Adult M 19" - 20" 27" - 28" Adult L 21" - 22" 28" - 29" Adult XL 23" - 24 29" - 30" Adult XXL 25" - 26" 30" - 31"