Castelli Estremo Gore-tex Infinium™ Windstopper® Overshoes. These warm cycling overshoes offer excellent winter protection against cold, wind, and moderate rain, performing well in sub-zero temperatures. Buyers note they are thick and provide good coverage for toes and ankles. However, sizing runs small, requiring ordering a size up for a proper fit, especially with larger cycling shoes. The durability of the front material and rear tab is a concern for some users. PRODUCT FEATURES:ONE GOAL KEEP YOUR FEET WARM 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™ WINDSTOPPER® 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.Espeficitations:Castelli´s warmest shoecover for extreme conditions GORE-TEX INFINIUM™ WINDSTOPPER® fabric for windproof water protection with maximum breathability.Polartec®.Power.Stretch®.Pro™ lining to keep you warm.Reflective details provide high visibility YKK® Aqua.Guard® zipper.High-durability material under foot. tradeinn Bikeinn