Custom-die-cut EVA foam insert—closed-cell, Shore C 30–70° (38° typical)—delivers rubber-like elasticity plus aging, ozone and chemical resistance, shielding contents from –50 °C to 120 °C without corrosion. Independent micro-cells cushion shock, block water, damp sound and insulate heat; sheets are cut-to-size in black, blue, red, white or any color, gloss-surfaced for an exact case fit, working with the shell to protect every item inside.