The Smartwool PhD Knit Knee Warmer helps your run by keeping your legs warm and allowing freedom of movement. They won't move around or slip down your legs because that's how they were made. The backs of the knees are a common sweaty place, so these Smartwool knee warmers have mesh ventilation there to reduce moisture. The backs of your knees are like armpits. But not as gross. I hate armpits.
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