Warm air rises naturally to circulate through footwear while cool air is pulled through bottom vents. Silent thermal convection prevents damage to fine leather. Dryer lets leather breathe and retain its natural oils to extend footwear life. Safely removes perspiration, wetness and odor from any footwear overnight. Improve foot comfort and health. Dry and store boots as long as you like without unplugging the dryer. Safe for leather, canvas, rubber, and all modern fabrics. Accepts boots up to 16" tall. Made in the USA. PEET Classic Boot Dryer M97