Knit-Rite Prosthetic Sheaths are engineered to primarily reduce friction and act as a moisture barrier. Prosthetic sheaths when combined with prosthetic socks are the ideal team to combat friction. Whether you are hiking or carrying on with your day, your limb’s volume is going to fluctuate. And when volume goes up or down is when friction is at its worst. Apply a Knit-Rite Prosthetic Sheath before you add prosthetic socks will help manage friction during “limb volume fluctuation”. Knit-Rite Sheaths have transfers (Knit-Rite's logo) on both sheaths of the pair to help you position the prosthetic sheath to maximize comfort.