Protective Helmet GIRO RADIX MIPS — matte sky blue pulse, Size S (51–55 cm)

The GIRO RADIX MIPS — matte sky blue pulse in Size S (51–55 cm) is a mountain bike protective helmet designed for trail and all-mountain riding. It combines a lightweight in-mold shell with multi-ventilation channels and MIPS technology to reduce rotational forces in certain impacts. The helmet includes an adjustable retention system and padded liners to help secure a precise, comfortable fit for smaller head sizes.

Advantages

The helmet's MIPS layer provides an added measure of rotational impact protection while the low-profile shell and in-mold construction keep weight down without sacrificing structural integrity. Multiple ventilation channels promote airflow on longer rides, and the adjustable retention system allows quick fit adjustments. Removable, washable liners maintain hygiene and comfort during repeated use.

Suitable for

• Trail and all-mountain riding
• Cross-country rides where extra ventilation is desired
• Riders with head circumference of 51–55 cm seeking a secure, adjustable fit
• Cyclists who want a helmet with rotational impact mitigation

When it may not be suitable

This helmet is focused on trail and all-mountain use and may lack some features desired for downhill-specific racing, such as extended rear coverage or an integrated chin bar. Riders who require a full-face helmet for high-speed technical descents should choose a purpose-built full-face model instead.

Key specifications

• Fit range: 51–55 cm (Size S)
• Construction: in-mold polycarbonate shell with EPS liner
• Impact mitigation: MIPS rotational protection system
• Ventilation: multiple front-to-rear vents and internal channels
• Adjustment: dial-based retention system for micro-fit
• Comfort: removable and washable padding
• Finish: matte sky blue pulse
• Intended use: trail / all-mountain

How to use

Place the helmet on the head so it sits level and low on the forehead, covering the top of the brow. Use the rear dial to tighten the retention system until the helmet feels snug but comfortable. Adjust the side straps to form a Y-shape around each ear and fasten the buckle under the chin, leaving enough room to fit one or two fingers between the strap and chin. Replace or wash liners as needed, and inspect the helmet after any significant impact; replace the helmet if it shows signs of damage.

What to consider before purchase

• Measure head circumference to confirm the 51–55 cm fit range is appropriate.
• Decide if MIPS rotational protection and ventilation align with your riding style.
• Confirm the matte sky blue pulse finish suits your visibility and aesthetic preferences.
• Consider whether you need additional rear coverage or a full-face helmet for aggressive downhill use.

Usage recommendations

For optimal protection and comfort, ensure the helmet is correctly sized and adjusted before every ride, maintain clean liners, and replace the helmet after significant impacts or after several years of regular use.