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CASTELLI Fast Feet 4 Sock White

CASTELLI Fast Feet 4 Sock

$78.99

Payment methods accepted: Diners, JCB, Amex, MC, Visa, Discover, Apple, Google, Paypal
An elite-level aerodynamic cycling sock system engineered for maximum airflow efficiency and race-day performance.
  • Designed for road racing, time trials, and high-speed performance riding
  • Integrated aero leg construction reduces drag around the lower leg
  • Silicone gripper upper maintains stable aerodynamic positioning
  • Low-bulk foot section optimised for close integration with road cycling shoes
  • Lightweight breathable fabrics improve moisture management during high-output riding
  • Race-focused fit developed for aerodynamic efficiency at speed

What type of riding is the Castelli Fast Feet 4 Sock designed for?

The Fast Feet 4 Sock is designed for road racing, criteriums, time trials, and aerodynamic performance riding.

Are the Castelli Fast Feet 4 Socks aerodynamic?

Yes. The sock system uses aero-optimised leg fabrics developed to reduce drag at high riding speeds.

Do the socks stay securely in place during racing?

Yes. A silicone upper gripper helps stabilise the aero leg section during high-intensity riding.

Are the Castelli Fast Feet 4 Socks breathable?

Yes. Lightweight fabrics are used to maintain airflow and moisture management during warm-weather riding.

Are these socks compatible with road cycling shoes?

Yes. The low-bulk foot construction is specifically designed for close integration with modern performance road cycling shoes.

  • Free shipping on all orders over $100 (before tax)
  • All orders are processed within 1 business day
  • Orders ship from our warehouse in Guelph, ON
  • Free shipping ranges from 2-6 business days depending on location within Canada
  • Expedited shipping options (which ranges from 1-3 business days) are available at checkout upon entering your shipping address
  • We ship with most major couriers, including Canada Post, UPS, Fedex, Purolator, Canpar, and ICS
  • Full shipping details can be found in our shipping policy
  • If your NOMAD purchase isn't quite right for you, you may return it for a refund within 30 days from delivery
  • Return items must be unused and accompanied by all original packaging, with both product and packaging in an undamaged state and all product tags intact
  • Refunds will be issued to your original form of payment within 2-5 business days of receipt of items at our distribution centre
  • We cannot accept returns or exchanges of the following items:
    • Nutrition products
    • Gift cards
    • Water bottles
    • Personal care items, such as body creams and lotions
    • Items marked as clearance or final sale
  • Return shipping fees are the responsibility of the customer
  • Full return details can be found in our return policy

Performance

The Castelli Fast Feet 4 Sock is engineered for elite-level aerodynamic performance during road racing, time trials, and high-speed competition. Developed using aerodynamic testing and race-focused construction techniques, the system is designed to minimize airflow disruption around the lower leg while maintaining lightweight comfort during sustained efforts.

Aerodynamic Construction

The extended aero leg section uses engineered fabrics specifically selected to smooth airflow and reduce drag at racing speeds. The close anatomical fit minimizes wrinkles and excess material, helping maintain consistent aerodynamic efficiency in aggressive riding positions.

Fit and Stability

A silicone gripper upper stabilizes the aero section during riding and prevents movement under race conditions. The lower foot section uses lightweight low-bulk materials designed for precise integration inside modern performance road cycling shoes without excess pressure or bunching.

Breathability and Comfort

Despite its aerodynamic focus, the Fast Feet 4 Sock maintains effective moisture management and ventilation for racing and training in warm conditions. Stretch fabric construction allows unrestricted movement while supporting a secure compression-style fit.

Intended Use

The Fast Feet 4 Sock is designed for competitive cyclists seeking maximum aerodynamic efficiency during road races, criteriums, time trials, and fast endurance riding where marginal gains are prioritized.

Key Specifications

Use: Road racing, criteriums, time trials
Construction: Aero-optimized leg fabric with lightweight foot section
Fit: Compression-style race fit
Stability: Silicone upper gripper construction
Breathability: Lightweight moisture-managing materials
Compatibility: Performance road cycling shoes

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