Hyperfly created this mask with you in mind, a product that is reusable, washable, lightweight, and durable. The neck string allows you to have it ready to go for when you need it most. Fukumen (ふくめん) is a Japanese word for mask. – Light weight red nylon ripstop. – 3 layer mask including pouch for additional filter (filter not included). – Outside shell: 100% PU coated polyester. – Inside lining: 100% micro polyester. – Woven Hyperfly Patches. – Reflective Side Patches. – Detachable neck string. – Reusable/Washable. – Travel hygiene bag. – One size fits most. Please note: This product is not medical grade. Hygien product, non-returnable.