Made from recycled materials, the Summit Casaval Midlayer Hoodie is an essential layer you can dial up or down depending on the temperature and conditions. Highly breathable Ventrix™ insulation technology features perforations in key zones that open with movement, allowing excess heat and perspiration to escape during high-output pursuits, while remaining closed in times of rest to retain warmth. There's a whole host of features, too, like the helmet-compatible hood, underarm gussets for full arms-up mobility, and water-resistant coating that protects against light showers. Plus, no shoulder seams mean this midlayer jacket is comfortable when wearing a backpack.