The Leg Spacer is designed to help relieve pressure and strain on the lower back, hips, knees and ankles. The spacer fits comfortably between your legs and keeps them in alignment with your spine. Simply place the pillow between the legs with the bottom edge at the knee. This will help relieve pressure on joints and improve circulation to lower extremities. The special contoured design stays in place and moves with you without the need for straps. Made of precision cut, high quality foam. It is the nature of polyurethane foam to discolor when exposed to light and oxygen. The polyurethane foam used in this product may have a slight odor when first removed from the packaging. The odor does not affect the performance of this product. Remove this product from packaging several days prior to use to eliminate odors from the manufacturing process. The standard size measures 10 x 8 x 6. No cover included.