The Shadowcaster Zero Hoodie is a sun hoodie that covers the head and neck, the two spots a plain long-sleeve shirt leaves open. An attached hood shades the head, and the built-in neck gaiter has laser-cut holes that keep air moving around the neck. What Our Gearhead(R) Experts Are Saying:"On a long afternoon drift in full sun, the blue rings in the Omni-Freeze Zero fabric react to my sweat by absorbing moisture and helping it evaporate. That cooling comes from the sweat itself, so it does less on a cool or dry day."