This stand collar vest is made of Polartec® 200 Fleece, a high-performance fleece material from Polartec®, a company specializing in fleece for applications ranging from layering systems for the US military to outdoor activities. This medium fleece boasts a lightweight, smooth touch and is durable and highly insulating, without being stuffy. Instead, it is exceptionally breathable. It features a combination design with water-repellent and durable nylon.