Cap's fire-retardant costume incorporated Kevlar body armor as well as a chain-mail shirt composed of light-weight "duralumin."
Cap had often worn a utility belt containing mission-specific equipment.
Formerly: Avengers Identicard. Cap also briefly wore an exoskeleton specially designed by Iron Man and Hank Pym while suffering a breakdown of the Super Soldier Serum
Captain America's Shield
was his primary, and usually only weapon. A concave disk about 2.5 feet in diameter, weighing 12 pounds, it was made of a unique Vibranium-Steel alloy that had never been duplicated. The Shield was cast by American metallurgist Dr. Myron MacLain, who was contracted by the U.S. government to create an impenetrable substance to use for tanks during World War II. During his experiments, MacLain combined Vibranium with a steel alloy he was working with and an unknown catalyst, creating the disc-shaped shield. MacLain was never able to duplicate the process due to his inability to identify the still-unknown factor that played a role in it; however attempts to reverse engineer its composition resulted in the development of adamantium. The shield was issued to Captain America by the government several months after the beginning of his career.
The shield had great aerodynamic properties: it was able to slice through the air with minimal wind resistance and deflection of path. Its great overall resilience, combined with its natural concentric stiffness, enabled it to rebound from objects with minimal loss of angular momentum. It was virtually indestructible: it was resistant to penetration, temperature extremes, and the entire electromagnetic spectrum of radiation. The only way it could be damaged in any way would be by tampering with its molecular bonding.