FREE COLD FOAM: Cold Foam Days at Starbucks take place from May 7 through May 11. Rewards members in the U.S. or Canada can add cold foam to a cold beverage for free.

Starbucks Rewards members are getting a perk with the coffee giants Cold Foam Days which will run from Wednesday to Sunday. Rewards members can redeem the free add-on by applying the coupon in the Starbucks app or by requesting it in-store at participating locations. (Photo by Smith Collection/Gado/Getty Images) Smith Collection/Gado/Getty Images

Starbucks is offering its rewards members a special perk for a limited time. The coffee giant is offering its Starbucks Rewards members the opportunity to customize their iced beverages with free cold foam on top. Customers can redeem the offer, called Cold Foam Days, from now until Sunday, May 11.