Most promotion code errors will display the error at the top of the page. If you don't see the promotion applied to your order after entering the code, scroll to the top of the page to see if there is a message displayed. If you are still experiencing problems when trying to apply a promotion code on the check out page, please contact us PRIOR to placing your order, and we will assist. Some coupon codes are ONE TIME USE ONLY. Please be sure to check the parameters and exclusions of the coupon code's description to be sure it does applies to specific product or sizes you are wishing to purchase.