The ION Windbreaker Zip Top is the perfect lightweight, 0.5 mm, long-sleeve top for the best in comfort and style. This top is great for mild weather when you want just a bit of warmth retention, protection from the sun or wind and rash protection from your harness or surfboard. It's a significant step up from a standard rash guard, with a body contouring technical fit. It can also be worn as an additional layer under your wetsuit when you need just a little extra warmth. The ION Windbreaker Zip Top features Flat Lock seams, a Sweep Cut, Wrist Tite construction, a Sunglass Loop and Slip Loop.