To forestall sunstroke, wear the Patagonia Long Sleeved Sol Patrol Shirt. It has endured the travel test for function forward UV protection in sweltering spots the world over. The 100% polyester ripstop fabric provides air conditioning and 30 UPF sun protection, while a new cooling mesh center back vent and side arm vents allow for maximum ventilation. The double layer collar stands up for extra sun protection or stays put with hidden snaps at collar points. Recyclable through the Common Threads Recycling Program.