Note: This item is a Sales Product Sample from Castelli, new with tags. We encourage you to use our official sizing charts above to determine if this product will fit you. We feel that these products run true to size according to our size charts. Castelli typically runs small so if you are in doubt please look a at the next size up on the chart. There are no additional sizes available, so please order thoughtfully.
We set out to create our warmest bootie ever, which meant rethinking how booties are made. For the windproofing we went with GORE-TEX INFINIUM™ fleece-backed fabric, which also lets more moisture escape than any other windproof fabric. Then we added a second fleece layer with Polartec® Power Stretch® Pro™, which is unrivaled in overall loft. The two layers are thick enough that we had to do a “wheel well” single-layer construction by the ball of the foot to prevent the fabric from rubbing on the crank. We made the bootie high for extra warmth and gave reasonable splash protection. We recommend our Venti Soft Sock for maximum warmth.
Castelli’s warmest shoecover for extreme conditions
GORE-TEX INFINIUM™ fabric for windproof water protection with maximum breathability
Polartec® Power Stretch® Pro™ lining to keep you warm
Reflective details provide high visibility
YKK® AquaGuard® zipper
High-durability material under foot
The Castelli Estremo Shoecover - Black is far and away, one of our most popular items. People can't seem to get enough of it.