Silver Rest Sleep Shop 10-Inch by 8-Inch by 4-Inch Knee Pillow 100% Polyester Imported Our leg spacer knee pillow is made of visco elastic memory foam The pillow creates the perfect space between your knees with the cradling of memory foam The velcro strap attaches to your leg so that as you turn and move throughout the night your sleep isn't interrupted by your needing to replace the pillow between your knees