Adult Cannula with 25' Kink Resistant Clear Tubing. Westmed product development engineers created a unique and proprietary elastomeric polymer that could be extruded and injection molded. Unlike conventional PVC cannulas, Comfort Soft Plus® is highly elastic and relieves pressure on and behind the ears, preventing pressure ulceration. The tubing acts as a “strain relief” when a patient's head turns. Free of DEHP and Phthalates to eliminate exposure to unnecessary risks. 25/case.