Filson's Mackinaw Wool Vest is a heritage-inspired layering piece that delivers warmth and breathability without bulk. Wear it under a raincoat, under a wool overcoat or over a heavy shirt for practical insulation and easy layering. Key attributes: Blue | Blu | Wool | Warm | Breathable | Low-bulk insulation | Button closure | Handwarmer pockets | Utility chest pockets | V-neck | Heritage-inspired design | Layering-friendly silhouette | Composition & care: 100% wool | Delicate dry clean only; do not wash in water; do not bleach; do not tumble dry; iron at 110°C.