The Therapeutic Rock Mat stimulates over 200, 000 foot nerve endings and increases proprioception. Firm foam applies pressure to specific parts of the sole of the foot and releases tension. Train natural proprioceptive capacity by standing and walking on the Rock Mat in the comfort of your own home without having to go out doors. Dimensions: 21\" by 12\" Wake Up Your Feet Standing on and exercising on the Rock Mat helps to stimulate the nerve endings in your feet, reduce pain and promote relaxation. Use It Anywhere Train natural proprioceptive capacity by standing and working out on the Rock Mat in the gym or the comfort of your own home. Lightweight & Portable The Sleek compact design makes the Rock Mat easy to transport with you to the gym, on a vacation or to the office. Adjust The Firmness If the mat is too firm at first, try putting a towel over the amounts to soften it or place the mat on top of a softer surface like a yoga mat or carpet.