Arc'teryx Proton Crew. I don't wear it much, so I'm selling it. Size: Men's S Color: Black Product Condition: I haven't worn it much, so it's in good condition with no scratches or stains. If you have any questions, please feel free to comment. I can also upload photos. Thank you. Product Description: For hiking, approaches, backcountry tours, and days in the mountains. The versatile Proton Crew Neck provides moderate insulation, comfortable airflow to regulate temperature, and freedom of movement. The soft and comfortable, ultra-lightweight Octa Loft insulation provides warmth and breathability to keep you comfortable. Made with Fortius Air 50, a lightweight, durable, and highly functional stretch material with excellent breathability. DWR treatment for water repellency. It can be worn as a mid-layer or on its own, and is suitable for all mountain activities.