Bike Helmet GIRO SOURCE MIPS (NEW 2026) L (59–63 cm), Matte Stone

The GIRO SOURCE MIPS (NEW 2026) L (59–63 cm), Matte Stone is a mountain bike helmet engineered for trail and cross‑country riding. It combines an in‑mold polycarbonate shell and EPS liner with an integrated MIPS rotational impact protection system to reduce rotational forces in certain impacts. The helmet features multiple ventilation channels, a precision retention system for a secure fit, and an adjustable strap layout to keep the helmet stable during aggressive riding. Its size range (L) accommodates head circumferences from 59 to 63 cm.

Advantages

This helmet offers a balance of protection, ventilation and fit adjustment suitable for off‑road cycling. The MIPS technology adds a layer intended to mitigate rotational loads, while the adjustable retention mechanism allows fine tuning for comfort. Ventilation channels are arranged to promote airflow over the head during sustained efforts. The matte stone finish provides a neutral aesthetic that pairs with multiple kit colors.

Suitable for

• Trail riding and enduro-style cross-country
• All-day off-road rides where ventilation and comfort are needed
• Riders seeking modern rotational impact protection
• Cyclists who require a size L fit (59–63 cm)

When it may not be suitable

This helmet is designed primarily for trail and cross‑country use and may not meet the specific ventilation or aerodynamic needs of road racing helmets. Riders requiring full-face impact protection for downhill bike parks should choose a dedicated full‑face helmet instead. Additionally, those with head sizes outside the 59–63 cm range will need a different size.

Key specifications

• Fit range: Large (59–63 cm)
• Protection system: Integrated rotational impact protection (MIPS)
• Construction: In‑mold polycarbonate shell with EPS liner
• Ventilation: Multiple airflow channels for cooling
• Retention: Adjustable precision retention system
• Strap system: Adjustable chin straps with secure buckle
• Finish: Matte stone color

How to use

Place the helmet level on your head so the front edge sits about one to two finger widths above the eyebrows. Adjust the precision retention system until the helmet feels snug but not tight, and fasten the chin strap, centering the buckle under the chin. Ensure the side straps form a V just below each ear and trim excess strap if necessary. Inspect the helmet before each ride for any visible damage and replace it after a significant impact or according to manufacturer guidance.

What to consider before purchase

• Measure head circumference to confirm a 59–63 cm fit is correct
• Decide whether MIPS rotational protection aligns with your safety preferences
• Check compatibility with any accessories (e.g., lights, cameras, goggles)
• Consider helmet weight and ventilation relative to your typical ride duration and climate

Usage recommendations

For optimal protection, replace the helmet after any significant crash, avoid exposing it to strong chemicals or prolonged sunlight, and periodically check fit and straps. Use the helmet for intended trail and cross‑country riding scenarios and pair it with appropriate eyewear and protective gear.