The McDavid Back Stabilizer provides maximum core support and helps to relieve back pain and back-related injuries. MAXIMUM SUPPORT: Protects from strains and pulls with six steel stays strategically positioned for maximum support BREATHABLE: Vented elastic side panels EASY TO FIT: Hook and loop closures with neoprene wrap for custom fit and comfort SUPPORT & ADVANCED COMPRESSION: Latex-free neoprene with micro-cell structure and cell memory for superior stretch, greater heat insulation and lighter, longer lasting support CONTENTS: 100% latex-free neoprene (CR)—exclusive of cover fabric. Panel: 90% nylon, 10% Spandex (elastane) ONE SIZE FITS ALL HSA/FSA ELIGIBLE CONTENT: 100% CR Neoprene / 90% Nylon / 10% Lycra Stand with stomach relaxed (c'mon, you're among friends here). Measure the minimum circumference (skinniest part) in the waist area, tape should be parallel with the floor. INCHES SIZE WAIST CIRCUMFERENCE S 25" - 31" REG 28" - 38" L 36" - 50"