Castelli Fast Feet 4 Cycling Socks
by Castelli
£40.00
GTIN08056006588303
EAN8056006588303
MPNCS26030001
Prices updated 5 Apr 2026
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Tredz Limited
BEST PRICEIn stock2 to 3 days
£40.00
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Product Description
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 they created a jig that replicates the movement of the lower leg. And they 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.
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