The new 5.11 Performance Winter Mock has improved thermal protection, fit, fabric, and function. The French terry knit has a textured face which traps the air generated from your body heat, keeping you warm in colder climates. Anti-microbial poly/nylon/spandex blend wicks perspiration in higher aerobic activity which is critical in colder outdoor environments. Base layer fit with 16% spandex it provides incredible flexibility and range of motion. Flat lock seams reduce chafing and provide the perfect thermal base layer for wear under body armor. Re-engineered cuff and neck keeps in heated air and adds to the mock's professional appearance. The Winter Mock is the ultimate piece of thermal protection equipment for operational use, hunting, and other outdoor activities.