MILFORD, CONN. — Subway Restaurants announced it is partnering with Halo Top Creamery to test a new line of hand-spun Halo Top milkshakes.

Subway will be the first brand to serve Halo Top’s ice cream in a milkshake. The restaurant will offer vanilla bean, chocolate and strawberry flavors at more than 1,000 locations in six test markets across the United States: Colorado Springs, Colo.; Hartford, Conn.; Longview and Tyler, Texas; Salt Lake City; Toledo; and West Palm Beach, Fla.

Subway said it was attractd to the ice cream company’s better-for-you options. Founded in 2011, Los Angeles-based Halo Top Creamery transformed the ice cream category with its low-calorie, high protein ice cream. Each milkshake will have 350 calories or less, at least 20 grams of protein and 30% of the recommended daily value of calcium, according to the restaurant chain.

“We are thrilled to kick-off this partnership with Subway and bring these hand-spun milkshakes to life for everyone to enjoy,” said Doug Bouton, president and chief operating officer at Halo Top Creamery. “We enjoy finding creative and innovative ways for people to eat more ice cream and feel good about it. We think this partnership provides the perfect platform to do just that.”

The milkshakes will be available in Subway’s test markets from July 22 through Sept. 4.