These things happen! We don't offer a direct exchange, but you can return your item within the 100 night trial (for mattresses) or 14 day return period (all other items) and re-order. You'll still be able to use the rest of the days in your mattress trial. We recommend getting the tape measure out before you place your new order!
When completing the form found on the link here, to ensure we can process your request as quickly as possible please request a 'Return' and not a 'Replacement'.