Founded in 1976. Celebrating 40 years. Frozen Custard: Double Rainbow is reintroducing a creamy, American Classic. Born on the boardwalk, Frozen Custard is a summertime favorite that evokes warm sand and cool surf. Double Rainbow Frozen Custard is uniquely thick and velvety. You'll savor the decadence of this timeless treat. Chocolate and Vanilla Malt: Good old fashioned chocolate malt and vanilla malt swirled together. Tastes just like when you were a kid. www.doublerainbow.com. From cows not treated with rBST (The FDA has said that no significant difference has been milk derived from rBST-treated and non rBST-treated cows). Made in the USA.