Made out Neoflex Neoprene and 96 % Nylon and 4% Spandex (elastaine) with a contrast color (elastaine) binding. It is form fitting and comes in 4 sizes Small, Medium, Large & X-Large.  These two great fabrics together allow for great flexibility and elasticity. They fit every type of body depending on what size and what fit you want to wear. This harness highlights your back and shows off your chest. The harness patterns are based on a basic fitted tee shirt pattern. Most can generally purchase the same size in tees that they buy. Hand wash cold; Do not use detergent; Hang Dry. SIZING: Small fits size 38-40 shirt size, Medium fits size 40-42 shirt size, Large fits size 42-44 shirt size.