What Our Gearhead(R) Experts Are Saying:"I tested this during a heatwave run and was shocked how much the ice pockets help. The AeroAdapt vents open up as you sweat, and the Dri-FIT ADV tech keeps the cap from getting soggy. Once the ice melts, the cooling effect along the neck is real-it buys you extra miles when the sun is brutal."We grab the Dri-FIT ADV Fly Cap Cooling when the day's heat is already rising and we still want to move freely outside. Nike's AeroAdapt ventilation reacts instantly to sweat, opening targeted vents that release heat just when we need it most. With Dri-FIT ADV woven throughout, the cap stays dry, breathable, and feather-light as we push deeper into the miles. What transforms the experience is the built-in cooling system. Three molded ice pockets sit along the crown, designed to hold strategically shaped cubes that melt slowly as we run. Channels in the waterproof panel route that cooling flow into the perforated cape, lowering the temperature across our neck and shoulders when the heat turns oppressive. It's a small detail that makes a big difference on exposed trails and sunbaked pavement.