RYZEN HELMET ZX-700R MONO (HALF FACE DUAL VISOR) SRP 2500DETACHABLE FOAM SET WITH ICCBOX INCLUSION: HELMET WITH CLEAR LENS DUST BAGHow to know your size? 1. Wrap tape measure around head approx half cm above ears and half cm above eyebrows. Use tape measure. 2. Have someone else take a note of the number for better accuracy. 3. Allow some tolerance for very long hair or thick hair, large cheeks and those who wear eyeglasses as well.SAFETY RECOMMENDATIONS1. NO HELMET CAN PROTECT YOU AGAINST ALL POSSIBLE IMPACTS AT LOW AND HIGH SPEED 2. ONLY USE A HELMET THAT COMPLETELY HOLDS YOUR ENTIRE HEAD AND TIGHTEN THE LOCKING SYSTEM SECURELY UNDER YOUR CHIN 3. HELMETS ARE DESIGNED TO ABSORB ONE IMPACT ONLY 4. CLEAN YOUR HELMET CAREFULLY 5. NEVER MODIFY YOUR HELMET 6. DO NOT MISTREAT YOUR HELMET 7. DO NOT REPAINT THE HELMET 8. ALWAYS CHECK YOUR HELMET BEFORE DRIVING YOUR MOTORCYCLE 9. KEEP THE SCREEN OF THE HELMET IN GOOD CONDITION 10. REMEMBER: HELMETS SOFTEN IMPORTANT SOUNDS AND REDUCE WARNINGS OF ENVIRONMENTAL CHANGES