Foam Roller, which is great for yoga, is designed to enhance balance, pilates core abdominal, back stabilization, body awareness, muscle re-education, flexibility, and dynamic strength. It is a high density, heat sealed foam roller which is 30% heavier & firmer than the ones from the same class. There are 4 different sizes and 2 colors available. The surface's smooth. The full round shape is high density which is 20% - 30% firmer than other.