**Description** The revolutionary new M11 helmet - envisioned by Mark Messier and engineered by the head protection experts at Cascade Sports - brings together the high-performance fit and feel demanded by pros and cutting-edge technology for maximum protection. The M11 is proven to absorb more energy from high impact linear forces than other premium helmets. Seven Technology: cutting-edge liner system utilizing a ground-breaking impact attenuation system to more effectively manage energy transfer from direct impact; total material reset of Seven Technology liner system proven to perform better than EPP on successive impacts ProFit System: dynamic contour system for 360 degree fit, no-tool micro-adjustments for fine-tuning, eliminates pressure points Mono90 Shell: light, streamlined design reduces direct energy transfer, 20 vents for maximum air flow and comfort Available in Small, Medium & Large -- Small: approx. 6.5-7, 20.4-22" -- Medium: approx. 6 7/8-7 3/8, 22.6-23.2" -- Large: approx. 7 1/4- 7 7/8, 22.5-24.8" Seven Technology Liner System: Multiple Impact technology that laterally displaces energy absorbed from a direct impact. Performs better than EPP. Mono90 Shell with 20 cooling vents uses the design as a vital stress member upon impact ProFit fit system: Dynamic contour system that allows easy, no-tool custom micro adjusts that eliminates pressure points Compatible with leading masks & shields Designed and manufactured in North America HECC and CSA certified