The use of select knitting processes allow the production of a cap liner with a separate eye opening and several distinct mesh structures that are individually designed to enhance the comfort of the eyes, nose, and mouth of the wearer. Generally, the cap liner comprises: (a) a cap body comprising an upper mesh structure; (b) a neck retainer that is integrally formed with the cap body; (c) an eye opening positioned in the cap body; (d) a first ear position positioned in the cap body comprising a second mesh structure; (e) a second ear position positioned in the cap body comprising a third mesh structure; (f) a nasal ventilation positioned in the cap body comprising a fourth mesh structure; (g) a mouth ventilation positioned in the cap body comprising the fourth mesh structure or a fifth mesh structure; (h) a neck retainer base positioned on the neck retainer that is integrally formed with the neck retainer and comprises a sixth mesh structure or a two-layered structure; and (i) an edging at least partially surrounding the eye opening that comprises a three-layered structure.