Helmet GIRO Radix MIPS — mountain bike helmet, Matte Black, size XL (61–65 cm)

The GIRO Radix MIPS helmet in Matte Black is a mountain bike helmet sized XL for head circumferences 61–65 cm. Engineered for trail and enduro riding, this helmet combines a hard outer shell, internal impact-absorbing liner and MIPS rotational impact protection to reduce rotational forces transmitted to the head during certain impacts. It includes multiple ventilation channels and an adjustable rear retention system to help maintain a stable, comfortable fit while riding on varied terrain.

Advantages

The helmet provides integrated rotational protection through the MIPS system, contributing to improved impact management. Its XL fit accommodates larger head sizes and the adjustable retention system ensures secure, personalized fit. Ventilation channels help manage airflow and heat build-up during prolonged efforts, and the matte black finish offers a low-profile appearance that resists visible wear. Construction balances coverage and weight to suit aggressive trail riding without excessive bulk.

Suitable for

• Trail and enduro mountain biking where added impact management is required
• Riders with large head circumference (61–65 cm) seeking a stable XL fit
• All-day rides where ventilation and adjustability are important

When it may not be suitable

This helmet is designed specifically for mountain biking and may be less suitable for road cycling disciplines where aerodynamic shape and minimal weight are higher priorities. It is sized for XL heads (61–65 cm), so riders outside that range should choose a different size. The helmet does not include accessories such as a built-in light or camera mount unless fitted separately.

Key specifications

• Intended use: mountain bike (trail / enduro)
• Size range: XL — fits head circumference approximately 61–65 cm
• Safety features: MIPS rotational impact protection and multi-density impact-absorbing liner
• Shell: hard outer shell with internal EPS or similar energy-absorbing liner
• Ventilation: multiple airflow channels for heat dissipation
• Fit system: adjustable rear retention dial and strap adjustments for secure fit
• Finish: matte black

How to use

Before each ride, adjust the rear retention dial so the helmet sits level on the head and feels snug without creating pressure points. Position the front of the helmet approximately two finger widths above the eyebrows to ensure proper facial protection. Fasten and tighten chin straps so they form a V-shape under each ear and secure the buckle; the strap should be snug but allow comfortable jaw movement. Periodically inspect the helmet for visible damage after impacts and replace if the liner or shell shows cracking or severe deformation. Clean with mild soap and water and avoid solvents or high-heat drying.

What to consider before purchase

• Confirm head circumference falls within 61–65 cm for correct XL fit
• Decide whether MIPS rotational protection aligns with your safety preferences
• Check helmet compatibility with any aftermarket accessories you plan to use (lights, visors, cameras)
• Assess ventilation needs relative to your typical riding conditions

Usage recommendations

Use the retention system to fine-tune fit before each ride, replace the helmet after a significant impact or once signs of material degradation appear, and pair the helmet with properly adjusted straps and a correctly fitted eyewear arrangement for optimal protection on trails.