A waterproof coat, also known as a raincoat or rain jacket, is a garment designed to protect the wearer from rain and moisture. It is typically made from a waterproof or water-resistant material that prevents water from penetrating the fabric and reaching the body underneath.

While keeping water out, modern waterproof coats also allow moisture vapor to escape, making them breathable. This feature helps prevent the build-up of sweat and keeps the wearer comfortable.