For the days that call for something more than a T-shirt but less than a button-down plus all the technical performance, you have the Euclid Short-Sleeve Shirt. The button placket makes it easy to adjust for style and comfort. This shirt is also bluesign®-approved, helping to reduce environmental impact and create positive change in Honduras through cool, eco-friendly designs through our Marmot x Thread partnership with Thread International. Postconsumer plastic bottles are recycled into Marmot UpCycle® quick-drying polyester fabric and then blended with cotton. Drying quickly and blocking the sun with its UPF-30 rating, this shirt will keep you cool and comfortable, whatever the day brings.