XS 32/34" S 34/36" M 36/38" L 38/40" XL 41/42" 2XL 43/44" 3XL 45/47" 4XL 49/51" 5XL 52/54". Tubular construction. Thin collar rib for modern appearance. Back neck tape for a clean finish. Made of 100% OCS Organic ringspun combed cotton.