Sleeve and shoulder blocked polo with self collar callaway opti dri technology transfers moisture away from the body to aid in evaporation callaway opti shield technology creates a layer of protection from the suns harmful rays callaway opti genic anti microbial treatment keeps the garment fresh over time reduces odor and helps maintain durability callaway opti stretch fabrics feature interwoven layers of spandex to ensure maximum range of motion so the garment moves with the golf swing 95