All Bikes
All Components
All Clothing
All Protection
All Accessories
All Workshop
All Outdoors
All Nutrition & Training
Castelli Fast Feet 4 Socks
Select options to see availability
What the stock status means
- In stock On the shelf in our own warehouse. Order before 2pm and it is despatched the same working day; bikes we build are built, safety-checked and despatched in 2-3 working days.
- In stock with our supplier Not on our shelves, but our supplier has it or it is already on its way to us. We bring it in as soon as you order, and the despatch estimate shown allows for that.
- Out of stock Neither we nor our supplier has it right now. Where a date is shown, more is on order and you can order now to secure one from that delivery.
- Stock to be confirmed Not on our shelves, and our supplier does not send us stock figures for it, so we cannot say how soon we could get one. Use "Check availability" and we will ask them and email you back.
Seen it cheaper? Ask us to price match
Attributes
| Suitable for | Everyone |
|---|
In-stock items ordered before 2pm are dispatched the same day. Free delivery over £50.
Thirty-day returns, free from any UK address.
About Castelli
Founded in 1876, Castelli has always represented the finest in Italian quality and performance cycling clothing. Castelli claim the 1st Lycra shorts, 1st coloured shorts, 1st sublimation printed jersey, 1st synthetic winter clothing, etc, etc....
Shop all CastelliDetails
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.
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
