These Brake Free XL Helmet Mounts are taller than the original mounts, holding the LED Light further way from the helmet surface. XL mounts are designed to help with fitment on XXL or larger helmets. They have 5mm added thickness to provide added clearance. This is helpful for helmets with ridges, vents or other parts that could otherwise interfere the attachment of the LED helmet light. XL MOUNT REQUIRED FOR ALL SIZES OF RUROC ATLAS, ICON AIRFORM AND SEDICI STRADA II