TECHNOLOGY : Impact Energy Mitigation System - MIPS Technology offers a low friction layer designed to mitigate rotational energy sustained during impact. ULTRA-LIGHTWEIGHT : One-piece polycarbonate (EPP) shell construction makes the Dynamic 9 Pro helmet the lightest weight in its class. PERSONALIZED FIT : Coming standard in all Dynamic 9 Pro helmets, the interchangeable side and rear occipital Fitpads are available in three thicknesses, providing 360-degree adjustability and a personalized fit. PERSONALIZE YOUR HELMET: The Fitpad System allows the helmet size to be adjusted 5% larger or smaller, creating a more optimal and personalized fit for each player. Side Fitpads - Interchangeable side pads available in 2mm, 6mm, 10mm thickness Rear Fitpads - Interchangeable rear pad available in 5mm, 10mm, 15mm thickness