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The Jastronaut is a cycling specific insole that uses aerogel technology to provide extra insulation for the bottom of your foot. While most winter cycling footwear provides adequate insulation for the upper part of the boot, insulating the bottom of the foot can be a challenge. If using clipless pedals, the cleat attached to the bottom of the boot acts as a thermal conductor, drawing heat away from the sole of the boot. The Jaztronaut insole provides another layer of insulation between the foot and the cleat.