Multilayer tubing having intermediate layer with additives

A method of forming a multi-layer tubing, comprising:

• co-extruding a base polymeric resin material into the multi-layer tubing comprising an inner layer, an outer layer concentrically disposed about and surrounding the inner layer, and an intermediate layer interposed between the inner and outer layers of the multi-layer tubing,
• wherein the intermediate layer comprises a light protection additive included therein, the intermediate layer providing protection from light between 250 nm to 450 nm with a minimum of 90 percent blockage, and the inner layer and the outer layer being barriers to prevent migration of the light protection additive from the intermediate layer,
• wherein the intermediate layer is co-extruded to a thickness less than that of at least one of the inner and outer layers,
• wherein the inner layer, the outer layer, and the intermediate layer are formed from the same base polymeric resin material, and
• wherein a hardness of each of the outer layer and the intermediate layer is at least 5 hardness units less than the hardness of the inner layer.