The Cirque River Vent shirt is designed for warm and hot summer days. The manufacturers Omni-Freeze Zero Ice fabric feels amazingly cool at the cuffs and collar, especially when damp with sweat. The rest of the shirt is made of allows for excellent freedom of movement, making it suitable for various activitieseven those where a button-up shirt might not typically be the first choice. Active Fit: This model has a slightly more fitted cut compared to Columbias standard sizing. - Highly stretchable material for exceptional freedom of movement - Sleeves can be rolled up and secured with a tab on the upper arm - A small microfiber cloth patch is sewn into the shirt for easy cleaning of eyeglasses or sunglasses - Chest pocket This shirt is part of Columbias Titanium collection, where high performance is always the top priority.