US Navy Custom Ship Cap - Naval Astronaut Officer GoldCustomizable U. S. Navy Ship Caps Add the ship name, hull number and if you like, text on the back of the cap. Like all of our custom products, these caps are embroidered in house. Hat Specs: 85% Acrylic, 15% Wool. Structured, mid profile, six panel with pre curved visor, sewn eyelets, and adjustable hook and loop closure. One size. This item uses hook and loop fasteners. (See video)