Optimum Nutrition Serious Mass – 6 lbs Flavors:Vanilla It now features shortened step

It now features shortened step height of only 10 inches

Rubber sole

Creates unique user logins for tracking of performance statistics and measuring improvement

making transportation effortless

Optimum Nutrition Serious Mass – 6 lbs Flavors:Vanilla It now features shortened stepAchieve your size and strength goals with Optimum Nutrition Serious Mass 6 lbs, the ultimate high calorie weight gainer for serious muscle building. Designed for hard gainers and athletes looking to pack on mass, Serious Mass delivers a powerful combination of calories, protein, carbs, vitamins, and minerals to help fuel recovery and growth. Each serving provides an incredible 1,250 calories, 50g of high quality protein, and over 250g of carbohydrates