S (M, L, XL, 2X, 3X): Back Width 22½ (24, 26, 27½, 29, 30½)”/ 57 (61, 66, 70, 73.5, 77.5) cm; Back Length (at center) 29 (31¾, 34, 36¼, 38½, 41)”/73.5 (80.5, 86.5, 92, 98, 104) cm