SW016554 Smartwool Men's Merino Sport 150 Polo Comfort. Performance. Style. Smartwool's Men's Merino Sport 150 Polo has it all, and then some. Made with Smartwool's lightweight, breathable, and odor resistant Merino 150 fabric, this shirt is designed to help keep you cool and comfortable as you work up a sweat. Smartwool strategically placed mesh vents in the shirt to allow you to beat the heat every summer day.