News Halo Top high-protein, low-calorie milkshakes are headed to 1,000 Subway restaurants July 1, 2019Dalvin Brown, USA TODAYComments Off on Halo Top high-protein, low-calorie milkshakes are headed to 1,000 Subway restaurants The Halo Top shakes are offered in vanilla, chocolate, and strawberry—all under 350 calories, with over 20 grams of protein.