Duckworth Vapor Long Sleeve Crew - Men's High performance Vapor Wool fabric is lightweight, no-stink, and ultra fast drying Heathered tri-blend fabric has a relaxed fit Summer weight wool fabric has all natural stretch with no added lycra Conductive Re-Vaporation keeps you cool during exercise Materials: 38% Helle Rambouillet Merino wool / 50% Recycled Polyester / 12% Modal