Sodium chloride (NaCl) the other component of the outer layer of the LoFric catheter. The salt increases the osmolality of the LoFric catheter and prevents the water from being removed from the catheter's surface. The patented addition of salt to the LoFric catheter coating is unique. It ensures balanced osmolality and so optimises both water binding and water retaining properties. LoFric is the only hydrophilic catheter which uses salt in this way to increase osmolality and ensure that water is retained on the surface of the catheter throughout the catheterisation process - from insertion to withdrawal.