SanSoleil Vent Back Patterned Mock 1/4 Zip - UV 50 Protection: SolCool 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.) - Long Sleeve UV 50 Protection: SolCool 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.)