Fits a knee circumference of 20 inches (about 50.8 cm).4.
27inch* Features:1.2. 3-level heating level setting: The heated knee pads can be heated in 3 seconds, and the 3-level heating settings can be adjusted to suit different needs. Portable and Lightweight: The knee heating sheath can be powered through the USB port, you can enjoy heating your joints anytime, anywhere.