Fisherman use netting when trawling, because it is sturdy enough to carry large amounts of weight as fish are trapped, pulled, then lifted out of water. Oftentimes, the filaments that make up the yarn are coated with wax or plastic. This coating adds a waterproof component to the textile that provides even more reliability. Net is also used in medical practices to provide fabric insulation and wrapping under an industry standard sling. In the medical practice, netting provides cushion and protection, when used in layers, but still allows the skin to breathe under the fabric. Depending on what the netting is being used for, a different wax or plastic coating can be applied in order to cover the filaments that use up the yarn.