The large opening sits over your kneecap to preserve a wide range of motion while the flexible velcro strap keeps the wrap comfortably in place for sprainsswelling post exercise soreness and arthritis therapearl hot and cold therapybull conforms to your body ndash extremely comfortable and soft on skinbull mess free and reusablebull non toxic ndash free of bpa lead latex and phthalatesbull microwaveable and freezableuse hotpearls conform and deliver soothing heat therapy to the desir