eBay announced today it is rolling out a new Guaranteed Delivery shipping policy this summer, offering three-day or less shipping for 20 million eligible items sold on the site.

As part of the program, shoppers will be able to filter results by items available for one-day and two-day delivery times. The Guaranteed Delivery program will not result in extra costs for sellers, but eBay says its sellers must meet “a required set of shipping standards” to be included.

“While the majority of items on eBay already ship within three days or less, as well as for free, Guaranteed Delivery will give shoppers even faster delivery options and the confidence that their items will arrive on time,” says eBay Senior Vice President Hal Lawton in the release announcing the new policy.

According to the announcement, if an eBay purchase is not delivered by the guaranteed delivery date, the buyer can request to have shipping fees refunded — or, if the shipping was free, the buyer will receive a coupon to be used toward their next eBay purchase. Buyers will also have the option to return an item that doesn’t ship on time at no cost to them.

The Guaranteed Delivery policy is set to launch in the US this summer, but exact dates were not shared.

eBay reports it has 1.1 billion listings available at any given time, and that 63 percent of purchases on the site are already delivered in three days or less.