Hello, in the relevant product, the back length measurement from the center back (excluding the collar) for size XS/38 is 68 cm. For size S/40, the back length measurement from the center back (excluding the collar) is 70 cm. For size M/42, the back length measurement from the center back (excluding the collar) is 72 cm. For size L/44, the back length measurement from the center back (excluding the collar) is 74 cm. For size XL/46, the back length measurement from the center back (excluding the collar) is 75.5 cm. For size 2XL/48, the back length measurement from the center back (excluding the collar) is 77 cm. Thank you for your interest.