The high-density EPP foam is eco-friendly and provides firm support that won't lose its shape over time. Ideal for all body types and effective for all fitness levels, including those in need of rehabilitation. It can also be used for stretches and balance exercises. Easy to clean and easy to carry, it's an exercise necessary for a strong and healthy body. Designed for loosening knots in muscles, core and spine stabilization, and strengthening Great for rehab exercises for the back, calves, hamstrings, gluts, and more Eases tightness in muscles after high-intensity training and improves overall flexibility High-density structure provides a deeper massage than rollers with smooth surfaces Made out of eco-friendly, high-density expanded polypropylene (EPP)