It’s not only lightweight and refreshing but it also blocks 97% of the sun’s harmful UV rays. It’s guaranteed to keep you cool; with its rear air vents to keep the breeze flowing in and the heat flowing out. The Tamarindo Tech Chambray shirt with a hint of stretch features our Secure Button Attachment System where fabric is threaded thru the button instead of individually sewn on resulting in more secure button attachments, secure front zipper pocket and fly rod & utility loop made specifically with your comfort in mind.