Pyramex Features: Low profile design. Tested and marked for reverse donning. Shell constructed from High Density Polyethylene materials. Rain trough on sides and back of helmet channel moisture away. Soft brow pad is replaceable. Replaceable suspensions and headbands also available. Snap Lock suspension features "tuck away" adjustments for all day, hassle free wear. Ratchet suspension is easy to adjust and allows the wearer to modify the fit while wearing hard hat. Universal accessory slots fit cap mounted ear muffs and accessories. Hats also accommodate chin straps. Testing: Impact, Penetration, Flammability, Electrical Insulation, Marking & Humidity.