SanSoleil SolTek Print Mock 1/4 Zip - UV 50 Protection: SolTec Offers Permanent UPF 50 Sun Protection. Never washes out. (Most other polo shirts only offer UPF 10 and use a topical "plastic spray" to produce their sun protection. This washes out after a few washes.) - Permanent Cooling: SolTec wicking and quick dry create a cooling effect that provides perfect comfort while protecting from the sun - Mesh Venting: Mesh inserts sewn ito sleeves create a billowing effect while walking. Keeping you cool and comfortable. - Easy Care: SolTec is light with Athletic Stretch, yet can be washed and dried in regular cycle. - Long Sleeve UV 50 Protection: SolTec by SanSoleil offers UPF 50 Protection. Other Long Sleeve Zip Mocks Do Not. - Mock Collar: High neck stand protects the back of neck. (The neck is the quickest aging skin on a woman's body.)