Seamless Knee Sleeve Four-way stretch elastic knee support offers lightweight, breathable, uniform compression without the warmth of neoprene. For minor knee injuries, arthritis, tendonitis, strains, and edema. Ideal for use under functional braces. Fits left or right. Specify size, see sizing below. Sizing: Measure circumference 4-3/4" below and 4" above the knee. X-Small, 9-3/4" to 11" circumference below knee, 14-1/2" to 16" circumference above knee; Small, 11" to 12-1/4" circumference below knee, 16" to 17" circumference above knee; Medium, 12-1/2" to 13-1/4" circumference below knee, 17" to 18" circumference above knee; Large, 13-1/4" to 14-1/4" circumference below knee, 18" to 19-1/4" circumference above knee; X-Large, 14-1/4 " to 15-1/2" circumference below knee, 19-1/4" to 20-1/2" circumference above knee; 2X-Large, 15-1/2" to 16-1/2" circumference below knee, 20-1/2" to 22" circumference above knee; 3X-Large, 16-1/2" to 18" circumference below knee, 22" to 23" circumference above knee.