NEW to our fleet of great ventilated shirts comes the Regulator Wind Shirt. Now you can stay cool in the heat and warm in the cold. Made from our featherweight UPF 30+ Duralite nylon, with some nifty features built in. Now your neck can be protected from the sun with a flip on the collar. Low profile zippers run from the cuff to the torso for extreme regulation options. Cool mornings, the zippers stay closed giving you a great wind shirt. As the sun heats up the day, zip open the zippers to your desired temperature......clever shirt.