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  • Castelli Estremo Shoe Cover
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CastelliEstremo Shoe Cover

Item # CST00UV

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Item # CST00UV

Estremo Shoe Cover

Winter rides never looked all that enticing before. Frozen toes just aren't your thing, and we don't blame you — but neither is the droning whine of the trainer. Castelli aims to make the blustery outdoors a little bit more appealing, with exceptionally warm kits that keep you toasty from head to toe, and the Estremo Shoe Covers take toasty-foot duty very seriously. They're built to handle extreme temperatures, and extreme conditions, rated for temperatures ranging from 4-degrees to 41-degrees Fahrenheit, and packing in GORETEX Infinium membrane for total protection from rain, snow, sleet, and wheel spray. The cover is built from Polartec Power Stretch Pro, which offers a fleece backed lining to trap heat on the inside, while the outer membrane wards off all showers and wind. A high cuff helps seal any gaps between your kit and your shoes, while an AquaGuard YKK zipper prevents moisture from sneaking in the back.

  • Take on the harshest winter rides with toasty toes
  • Polartec Power Stretch Pro fleece traps in heat
  • GORE-TEX Infinium fabric offers windproof water protection
  • Seal out every drop of rain and snow with YKK AquaGuard zip
  • Ultra-durable fabric under foot helps avoid tears and abrasion
  • High cuff seals out icy chills between your kit and shoes
  • Stay visible on frosty rides with reflective accents
Tech SpecsSize
Tech Specs
[membrane/laminate] GORE-TEX Infinium, [face fabric] Polartec Power Stretch Pro
YKK AquaGuard zipper
Recommended Use
road cycling
Manufacturer Warranty
1 year


Shoe Covers
US MEN SHOE SIZE 5 - 6.5 7 - 9 9.5 - 11 11.5 - 12 12.5 - 14
EU MEN SHOE SIZE 36 - 39 40 - 42 43 - 44 45 - 46 46 - 48
US WOMEN SHOE SIZE 4 - 6.5 7 - 8 8.5 - 11    
EU WOMEN SHOE SIZE 35 - 37 37 - 39 39 - 42    
Diluvio, Belgian Bootie
UNISEX US SHOE SIZE 5 - 6.5 7 - 11 11.5 - 14
UNISEX EU SHOE SIZE 36 - 39 40 - 43 44 - 47


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A welcome addition to my winter riding

  • Familiarity: I've used it several times
  • Fit: True to size
  • Size Bought: Large

So first, they are snug. I got them on a size 43 Sidi winter cycling shoe. The first fit will feel like there’s something wrong, but relax, take a deep breath, it fits. It was 31F and windy. The sun just vanished. I was not worried about being cold. It was the last thing on my mind. These are about as good as its going to get. They don’t feel delicate. Although I tend to treat them that way. The fleece is nice. Kind of billowy. Buy these and enjoy your cold rides.

Unanswered Question

Would these work with gravel/cx shoes like the Sidi Tiger with egg beaters?