Clinically proven to be the most effective, long-lasting hot/cold pack. Drop the Ice, Skurt the Hurt! ZipSkurt was created in response to numerous requests from our customers. You wanted larger sizes, as well as the ability to put on and take off a HurtSkurt without having to go over the foot/shoes. ZipSkurt is modular, meaning they zip together to create custom sizes! So instead of us making more and more sizes, you can make your own custom sizes to fit your needs! ZipSkurt features a zipper pull that locks in place when pressed down against the zipper so you can easily adjust the fit by un-zipping the zipper to your comfort level. ZipSkurt4 is (4) panels wide (like a small HurtSkurt) and (2) panels tall (like a medium HurtSkurt). Which is a BRAND NEW size for HurtSkurt! Great on it's own for elbow and foot treatment, or combine in it with ZipSkurt6 for custom sizes.