The Marmot Men's Kingswest Short Sleeve Shirt is made with bluesign® approved fabric, including recycled polyester. This is a Marmot UpCycle® product, which means this woven shirt meets the standards to conserve resources and reduce environmental impact. Made from SUPPLEX® nylon, the abrasion-resistant fabric features an incredibly soft handfeel, so it can take on tough outdoor adventures without feeling rough on your skin. Its UPF 50 rating offers plenty of UV protection from the sun's harmful rays while its updated fit adds versatility. The Marmot Men's Kingswest Short Sleeve Shirt is a performance-ready top always ready to tackle a tough hike.