DeFeet's Slipstream Shoe Covers fit snugly over your shoes to shield you from the cold and provide an aerodynamic advantage too. They also protect your shoes from weather and debris.
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These things are simple, relatively inexpensive, and work really well for those cool-but-not-too-hot mornings and days of fall and winter. Don't expect the warmest shoe cover out there, and they're not water-resistant, but because of that they're just right for days where you need a little extra warmth but don't want too much coverage, or sweaty feet. Because they're basically oversized socks, they're not the most durable out there, but I typically get a good season out of each pair before I wear them out--and for the price and comfort, I think that's AOK