Arc'teryx - Worn once. Perfect for upcoming mountain climbing! Velox SS Crew Men's. Size M, color DYNASTY This garment provides the breathability and moisture resistance needed for long-distance hiking on hot days. It uses stretchy Ríbro™ polyester micromesh, meeting the demands of summer performance. This material, with its excellent breathability and quick-drying properties, is designed to maximize air circulation and promote the release of moisture. It also has the durability to withstand hard use, such as carrying a backpack for extended periods.