Our Men's Intraknit™ Thermal Merino Base Layer Hoodie is a lightweight, flexible top with a helmet-compatible hood that’s made for your most extreme cold-weather activities. Merino wool yarns and gender-specific ventilation are perfectly placed to maximize thermoregulation and breathability during high-intensity activities, and the 3D mapping results in near custom fit and freedom of movement. When you're in their best base layers, you're ready for anything.