Men's Long Sleeve Performance Mock Turtleneck by Callaway Golf. Perfect under anything is this long sleeve cool when you need it and warm when you must have it mock. With a focus on function, fit, technology, performance and innovation, this X-Series knit combines the latest in fabric technology with the style and design that is Callaway Golf. Long sleeve mock neck with a split tail hem, Callaway silicon patch on right sleeve, and a Chevron loop label on button left of shirt. Heat transferred Chevron on center back neck. 100%polyester.