Seven Technology Liner System - Compresses and laterally displaces the energy from a direct impact, thereby reducing the probability of a concussion. Open cylinders of Seven Technology allow for air flow and cooling. SuperMono Shell/Mask - One piece shell and visor creates a more rigid system to manage frontal impacts. One piece design also shifts the balance point closer to the center of your head, making it feel lighter. Lined with a comfort layer of cross linked foam. Star wheels unlock, slide to adjust to your head size and re-lock for a perfect fit. Includes 3 jaw pads with different thicknesses so you get a snug fit. Tungsten mask design opens up the view of the field. Meets NOCSAE standards and is approved for box in field lacrosse in the CLA and OLA. Unconditional 1 year warranty. Standard (One Size Fits Most) 22 3/8" to 23 5/8". Custom helmets are built to order - please allow 10-15 business days for custom helmet orders.