Protective bike helmet GIRO Quarter FS — size S (51–55 cm), Matte Dark Shark

GIRO Quarter FS — size S (51–55 cm) in Matte Dark Shark is a protective bicycle helmet developed for urban riding, BMX and light trail use. The helmet has a low-profile shell and multi-density impact protection designed to manage different impact energies while keeping overall volume compact. Internal padding and an adjustable fit system provide stable positioning and comfort during everyday rides and sessions in skateparks or mixed-terrain routes.

Advantages

The low-profile shell reduces bulk and improves rider mobility while still offering coverage where it is most needed. Multi-density impact protection helps absorb and dissipate forces from varied impacts. Internal padding enhances comfort and sweat management, and the adjustable fit system allows precise sizing within the 51–55 cm range for reliable, secure fit. The matte finish provides a subdued aesthetic that resists glare and looks consistent with urban and action-sport styles.

Suitable for

• Urban commuting and city cycling
• BMX and skatepark sessions
• Light off-road or dirt jump trails
• Short group rides and everyday cycling

Key specifications

• Size range: S, fits head circumference 51–55 cm
• Shell type: low-profile, compact design
• Impact protection: multi-density construction for varied-energy impacts
• Fit system: adjustable retention mechanism for precise positioning
• Comfort: internal padding for cushioning and moisture control
• Finish: matte Dark Shark color

How to use

Place the helmet level on your head so the front edge sits just above the eyebrows. Adjust the retention system until the helmet feels snug but not tight; the helmet should not move significantly when you shake your head. Fasten and adjust the chin strap so it forms a V shape under each ear and secures comfortably under the chin. Replace internal pads as needed to maintain comfort and proper fit. Inspect the helmet for visible damage after any significant impact and follow manufacturer guidance for service life and replacement.

Usage recommendations

Use the GIRO Quarter FS for city commuting, BMX park sessions and light trail riding where a compact, adjustable helmet is preferred. For maximum protection, ensure correct sizing (51–55 cm for size S), secure strap fastening, and replace the helmet after any major impact or according to the manufacturer's recommended service life.