Wet feet lose heat 25 times faster than dry feet, whether moisture is due to rain and snow or built up sweat. Plus, sweat that builds up inside shoes and boots can turn into a breeding ground for dangerous bacteria such as E. Coli, Meningitis, and Klebsiella. Air-drying overnight only dries 2% of moisture from shoes and boots. Drysure not only dries your footwear properly, but restricts the growth of bacteria and fungi. Unlike other boot dryers that require batteries or need to be plugged in to a power supple, Drysure requires no electricity, making it portable and safe to use. Drysure is made from moisture-absorbing silica oxide beads surrounded by a shell that helps airflow. The bags will absorb for up to 10 uses before needing to be reactivated.