Headsweats HU7708OL Protech Cap With Neck Flap - White GrayHeadsweats HU7708OL Protech Cap With Neck Flap White Gray When you're running on those hot summer days when the humidity is high, it's important to keep your head cool and your neck in the shade. Our ProTech running caps feature a neck flap that you can tuck up for a 2 in 1 combo when the weather turns cooler, or let it hang down when the sun is shining. Plus, it dries three to four times faster than cotton.