Brandclub Callaway Mens Long Sleeve Core Performance Polo, Opti Dri KWH BW 00293 Callaway Mens Golf Shirt Customs Department Callaway Golf Clothing Performance Apparel for Men & Women Austad's Callaway Golf Clothing Performance Apparel for Men & Women Austad's. Callaway Men's Cap (Sweat absorbing, Quick drying) This Cool Core Cap is made with Cool Core, a sweat reducing material that cools the fabric when wetted, wrung out, and shaken. It's an essential item for preventing heatstroke and extreme heat. It features a soft brim and is lightweight. Product Details: Cool Core Men's Features: Smooth (sweat absorbing, quick drying) Free size Material: 100% Polyester Care instructions: Hand Wash Only Fit type: Adjustable Item number: C23191103