Waterproof (8000mm) hat with fleece lining and taped seams. Reflective tape in back. 100% polyester. Avoid fabric softener. Machine wash 40°C. Our outerwear does not contain perfluorinated chemicals, but has a polyurethane coating on the back of the fabric that prevents that water from passing through. We test our production before it is sent from the supplier to ensure that it does not contain perfluorinated chemicals as PFOS and PFOA.