Double Pull Lumbar Lower Back Support Belt Brace Neoprene for Spine Posture Pain Size:M/L/XL/2XL Medium: approx waist (25.9-29 inches) or (66~74 cm) Large: approx waist (32-37 inches) or (82~94 cm) XL: approx waist (37-41.7 inches) or (94~106 cm) 2XL: approx waist (41.7-46.4 inches) or (107~118 cm).