The Ace Wake Is Loaded With Features Combining Style, Comfort, And Adjustability. Best Known For Its 15 Open Vent Holes For Optimum Ventilation And Drainage, Removable Ear Guards, And Our Headlock Fit System.   • Shell: High-Impact Abs  • Liner: Dual-Density, Waterproof Eva  • Vents: 15 Open Vents For Ventilation And Drainage  • Interior: Full-Surround Interior  • Fit System: “Headlock” – Adjustable Rear Fit System  • Fit: 6 Sizes / 3 Shell Breaks  • Certification: Ce En 1385   Technology:   Hardshell High Density, Injection Molded ABS Shell   EVA Dual Density Waterproof EVA Liner   Rear Headlock Fit System