Advanced Premium Integrated Matrix (PIM) construction: A matrix of carbon fiber, aramid, fiberglass and organic non-woven fabric create a remarkably strong yet extremely light weight shell designed for superior fit and comfort using advanced CAD technology. For the perfect and compact dimensions, RPHA X comes in 3 different shells. 1st shell: X-Small to Small, 2nd: Medium to Large and 3rd: X-Large, XX-Large. Advanced Channeling Ventilation System (ACS): Full front to back airflow flushes heat and humidity up and out. Large eye port: For maximum visibility and superior goggle fit. COOL4EVER interior: Light weight, moisture wicking, odor free and anti-bacterial, premium soft feel with ginkgo extract. Innovative new fabric offers self-cooling properties which helps it cool down faster than other major fabrics. Extremely important for long hot rides. Crown and cheek pads are removable and washable. Snell/DOT approved. 5 year limited warranty.