pLumbar Support made of neoprene and CoolMax lining to allow for a cooler fit. Support contains 9 BIOflex concentric circle magnets and is available in two sizes. Ideal for back pain and provides extra support. /p pSize: S/M 33.5" x 9.5" fits waist sizes 24"-30"br L/XL 43" x 10" fits waist sizes 31"-40".br Magnetic Fields: 9br Gauss: 500 per magnet/p