VertiBax Core Lumbar Active Support A close fitting product that is worn comfortably during periods of exercise to provide support and stability to the lower back and core muscle groups. It increases blood flow to the injured area and provides even compression to the lower back as it is used during exercise; its unique shape allows it to be worn comfortably underneath clothes, preventing the build up of muscle tension and lower back pain. Once fitted the lower back support moulds to the shape of the body, remaining in place during intense exercise. Originally developed for UK and International Gymnasts, the VertiBaX Core Lumbar Active Support is a world leader in preventing injury to the body's lower back and core muscle groups during exercise. Featured in the Times Newspaper and used and endorsed by Horse Jumping guru Andy Austin and BBC award winning gardener Chris Myers, amongst others, this revolutionary lower back support is guaranteed to enhance your enjoyment of exercise if you are a sufferer of lower back pain. Gives support & stability to lower back & core Increaces blood flow to injured area Lightweight & comfortable fit under clothes Moulds to your body shape Sizing (measure around waist) Inches Centimetres Small 22"- 28.25" 55.9cm - 71.8cm Medium 28.5" - 35" 72.4 cm - 89cm Large 35.25" - 41" 90.4cm - 104.2 cm X-Large 41.25" - 46.5" 104.6cm - 118.1cm