Designed for chest port access but you don't have to have a port to love this shirt. 100% cotton. Last picture(black t-shirt) is to demonstrate the zipper functions. Retain your privacy in a comfortable and stylish fashion. Shoulder zipper on both side. Open either side of shoulder zipper along with mid chest zipper allow wide open chest access. Wide open chest access allow proper chest sterilizing/cleaning and port access. Accommodate both right and left chest port.