For all sizes beyond XL , for every X there is $1.49 Charge per X.

Example  : 3XL Reflective logo postal Tshirt 

$18.49+ 2x1.49= $2.98+18.49=

$21.47 for a 3XL Reflective Tshirt. 

if you know you are ordering a 2X or  better shirt it would help by purchasing 1 X-per X in your size After XL.

EX: 5x shirt 4x's charge

Ex: 3X Shirt 2's Charge