Callaway Men's Cap (Flex Fit) Golf C21291101 1120_ Navy FR eBay UK Callaway C23191103 Cool Core Men's Cap Callaway Core Performance Polo CGM211 Crowley Products Page 2 Deppmann Depot. 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