Castelli Fast Feet 4 TT Shoecovers: Aerodynamic Fabric for Time Trials and Triathlon (£52)
The Castelli Fast Feet 4 TT is an aerodynamic shoecover for time trials and triathlon-style efforts, on sale at Tredz. We have not tested it. This page collects what Tredz lists and the current price.
Available now: Castelli Fast Feet 4 TT Cycling Shoecovers — £52.00 at Tredz (listed RRP £70.00), correct at time of writing, 30 October 2026.
What the retailer lists
- Fabric: a smooth, aerodynamic fabric around the lower leg to reduce drag.
- Shoe section: a structured, dimpled section over the shoe that Castelli says manages airflow.
- Fit: designed to work best with road shoes, with a secure fit that stays tight and wrinkle-free.
- Underfoot: a durable section built for start ramps and transitions.
- Sizes: S to 2XL, covering Euro shoe sizes 36 to 48, per Castelli’s size chart on the Tredz page.
Where it fits for triathletes
The points below are our reading of the listed features, not test results.
- Race-day speed. Castelli designs them for time trials and triathlon-style efforts. We have not tested them, and Castelli gives no figure for the drag saving.
- Bike leg only. They fit over road shoes, so they suit a ride where you will not be stopping to remove them. Check how they work with your own shoes before race day.
- Price. At £52.00 they are £18.00 below the listed RRP.
- Price. At £52.00 it is £18.00 below the RRP.
Where to buy
Tredz lists the Castelli Fast Feet 4 TT Cycling Shoecovers at £52.00 at time of writing, and the link below goes to the same product page.
Related guides
See also the best triathlon cycling overshoes guide, the best aero cycling socks guide and the Castelli Estremo shoecover review.
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