1. Introduction
Thank you for choosing the Grivel Mutant Outdoor Helmet. This manual provides important information for the correct and safe use, fitting, maintenance, and storage of your helmet. Please read these instructions carefully before using the helmet and retain them for future reference.
The Grivel Mutant helmet is designed for climbing and other outdoor activities, offering ultralight protection with an EPP (Expanded Polypropylene) shell and ABS (Acrylonitrile Butadiene Styrene) plastic reinforcement. It features a unique 'Japan Fit' design for enhanced comfort.
2. Safety Information
- Intended Use: This helmet is certified for climbing and mountaineering activities according to EN12492 and UIAA106 standards. Do not use this helmet for activities for which it is not designed, such as cycling or motorcycling.
- Inspection: Always inspect your helmet for any signs of damage (cracks, dents, fraying straps) before each use. If any damage is found, replace the helmet immediately.
- Impact: A helmet is designed to absorb the force of a single significant impact. Even if no visible damage is apparent after an impact, the helmet's protective capabilities may be compromised. Always replace your helmet after any significant impact.
- Fit: Ensure the helmet is properly fitted and securely fastened to provide maximum protection. An improperly fitted helmet may not offer adequate protection.
- Modifications: Do not modify or remove any original parts of the helmet. Any alterations can compromise its safety features.
- Chemicals: Avoid contact with chemicals, solvents, paints, or adhesives, as these can damage the helmet's materials and compromise its protective integrity, even if the damage is not visible.
3. Components
The Grivel Mutant helmet consists of the following primary components:
- Outer Shell: Constructed from ultralight EPP (Expanded Polypropylene) with ABS (Acrylonitrile Butadiene Styrene) plastic reinforcement on the top for enhanced durability.
- Internal Padding: Provides comfort and additional impact absorption.
- Adjustment System: A minimal adjustment system at the rear allows for a secure and comfortable fit.
- Chin Strap: Adjustable strap with a buckle for securing the helmet under the chin.
4. Setup and Fitting
Proper fitting is crucial for the helmet's effectiveness. Follow these steps to ensure a secure and comfortable fit:
- Choose the Correct Size: The Grivel Mutant helmet is available in various sizes to accommodate different head circumferences. Refer to the specifications section for size ranges. The 'Japan Fit' design features an internal width and depth optimized for a rounder head shape.
- Position the Helmet: Place the helmet on your head so that it sits level and covers your forehead without obstructing your vision. The front rim should be approximately two finger-widths above your eyebrows.
- Adjust the Rear System: Use the minimal adjustment system at the back of the helmet to tighten or loosen the fit around your head. The helmet should feel snug but not uncomfortably tight. It should not move excessively when you shake your head.
- Adjust the Chin Strap: Fasten the chin strap buckle. Adjust the strap tension so that it is snug under your chin, preventing the helmet from rocking forward or backward. Ensure the straps form a 'V' shape around your ears.
- Final Check: Once adjusted, try to move the helmet from side to side and front to back. It should remain stable on your head. If it moves significantly, re-adjust until a secure fit is achieved.
The L/XL size is designed to accommodate wearing over a balaclava or hat, if desired, while maintaining a secure fit.

Image showing the Grivel Mutant Outdoor Helmet, highlighting its lightweight design and ventilation. The helmet features a black main body with white accents.
5. Operating and Usage
Once properly fitted, the Grivel Mutant helmet is ready for use in appropriate outdoor activities. Always ensure the helmet is worn correctly and securely fastened throughout your activity.
- Wear Continuously: For maximum protection, wear your helmet continuously during all phases of climbing or other activities where head protection is necessary.
- Visibility: Ensure the helmet does not impair your vision or hearing, which are critical for safety in outdoor environments.
- Compatibility: If using other equipment such as headlamps or goggles, ensure they are compatible with the helmet and do not interfere with its fit or function.
6. Maintenance and Care
Proper maintenance will extend the life of your helmet and ensure its continued protective capabilities.
- Cleaning: Clean the helmet using only mild soap and lukewarm water. Use a soft cloth or sponge. Avoid abrasive cleaners, brushes, or harsh chemicals, as these can damage the helmet's materials. Rinse thoroughly with clean water.
- Drying: Allow the helmet to air dry completely at room temperature, away from direct sunlight or heat sources. Do not use artificial heat to dry the helmet.
- Disinfection: If necessary, the internal padding can be gently disinfected with a mild, non-abrasive disinfectant solution, followed by thorough rinsing and air drying.
- Service Life: The lifespan of a helmet can vary depending on usage, care, and environmental factors. Even without visible damage, materials can degrade over time. Grivel recommends replacing helmets after a maximum of 10 years from the date of manufacture, or immediately after any significant impact.
7. Storage
Store your Grivel Mutant helmet properly to prevent damage and prolong its lifespan.
- Location: Store the helmet in a cool, dry place, away from direct sunlight, extreme temperatures, and sources of heat.
- Chemicals: Keep the helmet away from chemicals, solvents, fuels, and corrosive substances.
- Protection: Store the helmet in a way that protects it from physical damage, such as being crushed or dropped. The helmet's minimal adjustment system and compact design facilitate easy storage.
8. Troubleshooting
If you encounter issues with your Grivel Mutant helmet, consider the following:
- Helmet feels loose or uncomfortable: Re-adjust the rear fitting system and chin strap according to the 'Setup and Fitting' section. Ensure you have selected the correct size for your head circumference.
- Visible damage (cracks, dents, fraying straps): The helmet's protective integrity may be compromised. Replace the helmet immediately.
- After an impact: Even if no visible damage is present, the helmet's ability to protect may be reduced. Replace the helmet after any significant impact.
For any issues not resolved by these steps, please contact Grivel customer support.
9. Specifications
| Model Name | Mutant |
| Model Number | GVHEMUT |
| Materials | Shell: EPP (Expanded Polypropylene), ABS (Acrylonitrile Butadiene Styrene) resin |
| Certifications | CE, EN12492, UIAA106 |
| Head Circumference (S/M) | 48-58 cm |
| Head Circumference (M/L) | 53-61 cm |
| Head Circumference (L/XL) | 54-62 cm |
| Approximate Weight (S/M) | 150 g |
| Country of Origin | China |
| Age Range | Adults |
10. Warranty and Support
Grivel products are manufactured to high standards. For information regarding warranty terms and conditions, or for any product support, please refer to the official Grivel website or contact Grivel customer service directly. Please have your helmet's model number (GVHEMUT) and proof of purchase available when contacting support.
Grivel Official Website: www.grivel.com