Always warm, breathable and wind resistant, worn as a mid-layer or standalone the Arcteryx Atom Heavyweight Hoody is one of their most versatile insulation pieces. Its Coreloft synthetic insulation is efficient, effective, and resilient. Mapped for optimal performance, it works well even if wet. The lightweight, wind-resistant, and water-repellant Tyono 30 shell are treated for extra durability, and Permeair panels under the arms add ventilation. The insulated, helmet-compatible hood adds warmth and protection.