Castelli Fast Feet 4 Sock, Black colourway
Castelli Fast Feet 4 Sock, White colourway
Castelli Fast Feet 4 Sock, Black colourway
Castelli Fast Feet 4 Sock, White colourway

Castelli Fast Feet 4 Sock

£40.00 £36.95 Save £3.05
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  • ★★★★★ 150+ five-star Google reviews

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 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.

Sizes and fit

Available in sizes S/M, L/XL and XXL, with an updated cuff fit for more comfort and aerodynamic gains.

Colours

Available in Black and White.

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