NikeStore.com has evolved to give you more time in checkout to verify your information and complete your purchase of new releases.
Customers who are first to add their size to the cart and get to the payment step (screen shot below) will have a temporary hold on that pair. Once you reach the payment step with your product, take your time to verify your information and complete the checkout process knowing that the product is held for you for a reasonable amount of time.
When all units of a size are held, the size will not show as available on site. If any consumers holding a pair in checkout don’t complete checkout, those sizes will become available on the site again in a short time period.
Once all pairs have been fully ordered, we will tweet that the style is sold out.