JSB Contoured LS Support is a scientifically designed back support belt with contoured malleable splints, which give the belt the natural contoured shape of a human back. Its cushioned back gives maximum comfort and its double lock elastic bands, gives flexibility of tightness to the user. Available sizes : Circumference around top edge of ankle joint Small 28" to 32" (70 to 80 cm) Medium 32" to 36" (80 to 90 cm) Large 36" to 40" (90 to 100 cm) X Large 40" to 44" (100 to 110 cm) XX Large 44" to 48" (110 to 120 cm)