The Royal Robbins San Seco Short Sleeve Shirt has a casual, standard fit that will keep you cool and comfortable on all your weekend adventures. Featuring an updated relaxed collar that gives this shirt a laid-back feel, this shirt is made with a blend of carbon-zero TENCEL™ Modal fibers, certified as CarbonNeutral™ by Natural Capital Partners. It has a basecamp graphic on the back, as well as a drop-in chest patch pocket and natural coconut buttons as an alternative to plastic, petroleum-based buttons.