Unicor Reflective US Army IPFU Jacket - Size Medium/Regular The Improved Physical Fitness Uniform(IPFU) is made from water resistant nylon fabric and can resist snow, rain, & freezing wind. It has a mesh lining & zips under the arm pits for when ventilation is needed. Ultra reflective in low light settings, which is great for early mornings or dusk workouts to be sure to be seen. The jacket is in excellent condition & the size is medium regular.