Magnetic Therapy Knee Support Wrap. Do you suffer with knee pain? This is a very popular product which provides support and therapeutic pain control. Don't be fooled by imitations. We use only quality north pole magnets. Pull the warmer on like a sock up over your knee. A tube shaped knee warmer made with stretch cotton with a soft cotton inner liner. Contains 32 North pole 3950 gauss ceramic magnets. These wraps run very small, so be sure to measure your knee 2" above your knee cap around your quad muscle with a tape measure, to get the correct fit. You will want a snug fit. To properly clean, must be hand washed. Choose your size from the drop-down menu. Free Shipping M193 - Medium (fits up to 13" stretched) M195 - Large - (fits up to 15" stretched) M194 - XLarge - (fits up to 17" stretched) M196 - XXLarge - (fits up to 21" stretched) M197 - XXXLarge - (fits up to 23" stretched)