Castelli Fast Feet 4 Sock
Castelli Fast Feet 4 Sock
Castelli Fast Feet 4 Sock
Castelli Fast Feet 4 Sock
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Castelli Fast Feet 4 Sock
Castelli Fast Feet 4 Sock
Castelli Fast Feet 4 Sock
Castelli Fast Feet 4 Sock

Castelli Fast Feet 4 Sock

Price
$89.99
Variant:Black - S/M
In stock! Usually ships within 24 hours.

For road racing or when you can't wear a Fast Feet TT Shoecover, this sock saves watts.

PRODUCT FEATURES 

Castelli's Fast Feet project — for maximum aerodynamics

Foot portion based on Castelli Rosso Corsa Sock for in-shoe comfort

Polyurethane grip strip at top to keep sock in place

Leg portion constructed with engineered grooved Lycra® to help detach airflow

TECHNICAL FEATURES

Insulation 1/5

Waterproofness 1/5

Windproofness 1/5

Breathability 4/5

Lightness 4/5 

  • Weight:48 g
  • Temperature:10°C - 38°C / 50°F - 100°F
  • Fit:Race

 


FAST FEET 4 SOCK

There are lots of so-called aero socks out there. But the Castelli Fast Feet 4 Sock has the development and testing to back up the claim. The few socks that have been tested have probably been tested with a static, nonmoving test because it's easier. But a foot is always in motion, so we created a jig that replicates the movement of the lower leg. And we tested it on actual riders to verify the results. This sock can save 2 watts at 50 km/h. The newest version has an updated cuff fit for more comfort and aerodynamic gains.
Shipping Information

Our on-line store is open 24/7 and we ship Monday through Friday, excluding some holidays. Orders received for products without shipping restrictions on its product page will ship the same business day when received before 12:00 p.m. PST. Orders in high demand will have an estimated production time listed on its product page and will ship according to the date listed.

About Us

Bikefit Marlborough exists to grow Cycling, through our Knowledge, Passion and outstanding Customer Service.

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