Description of Marmot Kaos L/S Shirt The Kaos takes advantage of cool, comfortable and quick-drying synthetic fabrics to create a versatile shirt that transitions smoothly from a base layer in the cool of morning to an outer layer in the heat of the day. Features: Main Material: 50% UpCycle™ Polyester/50% Cocona® Polyester Cocona® Natural Technology Cocona Natural Technology Flat Lock Seam Construction Half Zip Underarm Gusset UpCycle™ Recycled Polyester UpCycle Recycled Polyester UPF Protection 50