Castelli Fast Feet aero socks review

Feeling fast is halfway to going fast - and these socks certainly look the part

Cycling Weekly Verdict

The Castelli Fast Feet aero socks are lightweight and breathable, making them a pleasure to wear during hard efforts. Although the aero gains aren't likely to be huge, given how comfortable they are, you might as well reap them. However there is one caveat; if wearing the socks for over six hours, the silicon gripper can start to cut in.

Reasons to buy
  • +

    Potential for aero gains

  • +

    Looks the part

  • +

    Very well ventilated

  • +

    Silicon gripper keep them in place

Reasons to avoid
  • -

    Gripper can cut in after 6 hours

You can trust Cycling Weekly. Our team of experts put in hard miles testing cycling tech and will always share honest, unbiased advice to help you choose. Find out more about how we test.

Castelli's fast feet aero cycling socks are constructed with “engineered grooved Lycra to help detach airflow,” with the intention of improving aerodynamics for faster riding.

The gains fall very much into the “marginal” end of the spectrum, slipping these on won't have you suddenly dropping your mates on the flat. But if you've got a little bit of cash to spare, it certainly can't hurt - and there has been a fairly wide take up of this style of sock by the pro peloton, especially in TTs.

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Stefan Abram
Tech features editor

After winning the 2019 National Single-Speed Cross-Country Mountain Biking Championships and claiming the plushie unicorn (true story), Stefan swapped the flat-bars for drop-bars and has never looked back. 

Since then, he’s earnt his 2ⁿᵈ cat racing licence in his first season racing as a third, completed the South Downs Double in under 20 hours and Everested in under 12.

But his favourite rides are multiday bikepacking trips, with all the huge amount of cycling tech and long days spent exploring new roads and trails - as well as histories and cultures. Most recently, he’s spent two weeks riding from Budapest into the mountains of Slovakia

Height: 177cm

Weight: 67–69kg