Durable, breathable, light, and insulated, the Arcteryx Proton Hoody is a warm midlayer for high-output alpine activities. This technical men's puffy features Coreloft Compact synthetic insulation in the body and its helmet-compatible hood, which means the Proton continues to warm even when wet. Breathable insulation paired with air-permeable fabrics means excess heat and moisture can pass through, regulating your body temperature and keeping you comfortable, even on challenging climbs. In addition to being air-permeable, the Fortius Air 20 face fabric is 60x more durable in abrasion tests than the industry standard. In other words, the Proton Hoody is well-equipped to handle whatever you throw its way. Coreloft Compact in the body and hood for breathable, wet-resistant warmth Fortius Air 20 fabric is air permeable and rugged for outdoor performance Durable water repellent (DWR) finish sheds moisture Winter 2023/24 product Equipped With Durable Water Repellent (DWR) DWR is a fabric treatment that improves the water-repellency of the outer layer of the material while maintaining its breathability.