Lightweight, compact, and comfortable helmet with innovative design and good ventilation thanks to the 10 air vents (with aluminum protective mesh) that keep the head cool at all times. Equipped with a simple, effective adjustment mechanism for quick size adjustment via a rubber-coated adjustment wheel on the back of the Kask helmet. High-density, impact-resistant outer shell. Inner shell made of polystyrene foam with openings for ventilation and air circulation. Fitted with clips on the outside for attaching all standard headlamps, made from high-strength acetal resin. Soft nylon headband, attached to the outer shell without the use of metal rivets. Inner padding consisting of headband, visor, and forehead piece, fully removable and washable by hand or machine at 30°C. Hypoallergenic fabric 2 dry: fresh and breathable, with Polyhygiene treatment to inhibit bacterial growth and bad odors. Straps with four attachment points for better fixation of the Plasma AQ helmet on the head. Attached without the use of metal rivets on the shell. Fastening and unfastening through a quick-release mechanism in accordance with CE EN 397 standards. Equipped with two side devices made of soft polyethylene for adjusting strap length and with a ring for attaching the helmet to a belt. Retrofit with Kask visors possible. Compatible with all Peltor and MSA hearing protection models with bayonet connection through the appropriate accessories.