Every shirt has a place in your closet, but the Howler Brothers El Mono T-Shirt is the only one you'll want to wear this summer. Made with a cotton, polyester blend, the shirt offers all day comfort as you bounce from the morning farmer's market to late-night bike rides through town,. A casual summer shirt for long days out and about. Cotton, polyester blend offers all-day comfort. Soft-touch graphic print of el mono itself. Material: cotton, polyester. Fit: slim. Recommended Use: casual. Manufacturer Warranty: limited lifetime.