Mountain Bike Helmet GIRO SOURCE MIPS model GR-39311-E02-L matte sky blue pulse, size L (59–63 cm) NEW 2026

The GIRO SOURCE MIPS matte sky blue pulse in size L (59–63 cm) is a mountain bike helmet engineered for trail and enduro riding. It incorporates a multi-directional impact protection system (MIPS) to reduce rotational forces during angled impacts and provides a secure, adjustable fit intended for extended rides. The helmet combines ventilation, coverage and an in-mold shell construction to meet certified head protection requirements for off-road cycling.

Advantages

The helmet offers rotational impact mitigation through MIPS technology while maintaining a lightweight in-mold construction. Its extended rear coverage and internal shape improve protection on technical trails, and a dial-fit retention system allows quick micro-adjustments for a consistent fit. Multiple ventilation channels balance airflow and cooling with debris protection, making the helmet suitable for sustained pedal sessions and mixed-terrain descents.

Suitable for

• Trail and enduro mountain biking where extended coverage and impact protection are needed
• All-day rides that require adjustable fit and ventilation
• Riders looking for a helmet with rotational impact protection (MIPS)
• Cyclists who prefer a matte finish and contemporary styling

When it may not be suitable

This helmet is designed specifically for mountain biking; it may be less appropriate for disciplines that require full-face protection such as downhill racing at competitive levels. Riders seeking the lightest possible road helmet optimized solely for speed and minimal ventilation might prefer a dedicated road model.

Key specifications

• Fit range: Large size designed to fit head circumferences approximately 59–63 cm
• Protection system: Multi-directional impact protection concept for reduced rotational forces
• Construction: In-mold shell with internal EPS liner for impact energy management
• Coverage: Extended rear and temple coverage suited for off-road use
• Ventilation: Multiple intake and exhaust channels for airflow
• Retention: Adjustable dial-fit retention system for micro-adjustments
• Finish: Matte sky blue pulse exterior

How to use

Place the helmet on your head so it sits level and low on the forehead. Adjust the dial-fit retention system until the helmet feels snug but comfortable, and fasten the chin strap so there is no more than two fingers' width between the strap and your chin. Ensure the side straps form a V just below each ear and trim any excess strap if necessary. Inspect the helmet for visible damage before each ride and replace it after a significant impact or if structural damage is detected.

What to consider before purchase

• Measure your head circumference to confirm the 59–63 cm fit range matches your size
• Decide if MIPS rotational protection and extended coverage meet your riding discipline requirements
• Consider helmet weight and ventilation relative to typical ride duration and climate
• Check compatibility with accessories such as goggles, sunglasses, or aftermarket communication mounts

Usage recommendations

Use this helmet for trail and enduro rides where a balance of ventilation, coverage and rotational impact protection is desired. Replace the helmet after any crash that causes significant impact, and follow manufacturer care instructions to maintain fit and protective properties.