Subway Restaurants, Milford, Conn., and Los Angeles-based Halo Top Creamery are partnering in an exclusive collaboration to test hand-spun Halo Top milkshakes at nearly 1,000 participating Subway restaurants across the United States. Subway said it will be the first brand ever to serve Halo Top's ice cream in a hand-spun milkshake.

For a limited time only, July 22 through Sept. 4, guests may enjoy three milkshake flavors: Vanilla Bean, Chocolate and Strawberry. Each milkshake is crafted with Halo Top ice cream and has 350 calories or less, at least 20 grams of protein and 30% of the recommended daily value of calcium, Subway said.

The hand-spun Halo Top milkshakes will be available exclusively at Subway in six test markets: Colorado Springs, Colo.; Hartford, Conn.; Longview and Tyler, Texas; Salt Lake City, Utah; Toledo, Ohio; and West Palm Beach, Fla.

"We are passionate about creating delicious new menu items for our guests that can't be found anywhere else,” said Len Van Popering, Subway's chief brand and innovation officer. "We are excited to bring this popular brand to our guests in a never-before-seen way that we know they will love."

Subway noted that Halo Top disrupted the ice cream category by offering delicious ice cream with just 280 to 360 calories and 20 grams of protein per pint.

"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 of Halo Top. "We enjoy finding creative and innovative ways for people to eat more ice cream — and feel good about it — and we think this partnership provides the perfect platform to do just that."