The Patagonia Men's Back Step Short Sleeve Shirt is an airy, yarn-dyed top that will keep you cool and comfortable on a warm summer day. The fabric is a soft, breathable blend of hemp and organic cotton, weaved to keep you nice and cool. This durable blend of natural fibers is as environmentally friendly as it is comfortable. Features a button-front with forward shoulder seams for comfort under pack straps and coconut buttons.