protective helmet 3d model

Futuristic American football helmet shell, hard-surface industrial design, symmetrical geometry, smooth matte gray material, no logos, no text, no visor, no facemask. The helmet has large open ventilation cutouts that pass completely through the shell, with no mesh, no filler, and no internal geometry inside the vents. Designed as a wearable display prop, uniform shell thickness, clean topology, hollow interior, no surface textures, no decals, no fabric. No mesh inside vents, no grilles, no fabric, no padding, no logos, no text, no carbon fiber, no surface texture, no filled holes, no internal structures, no noise geometry.