The CVN code (or CVV2/CVC2) is a special 3-4 digit code used as an additional security measure for online transactions.
On most cards, this number is a 3-digit code on the back of your card, near the signature strip. On American Express cards, the 4-digit code is above and to the right of your card number on the front of the card.
All sizes below are general estimates and do not account for manufacturer defects. Many vendors use various brands of apparel and Smosh cannot guarantee size or fit of any particular item.