Hockey Sockey only accepts size exchanges placed within 30 days of the original garment purchase date. Please see your original emailed invoice for your purchase date. If you would like to make an exchange please add the above Sizing Exchange Form to your cart and proceed with checkout. Once the transaction is complete you will emailed an invoice with a link to download our Sizing Exchange Form in PDF. There is a $19.99 cost for this transaction which pays for our cost to ship you out the new onesie.