The Hy'n Dry boot safely silently and thoroughly. Natural Thermal Convection - Ceramic Heating Unit produces Natural Thermal Convection Heat that naturally rises and circulates to dry boots & shoes quickly. Drip Tray - Convenient Drip Tray collects dirty water dripping keeping the floor clean. Sturdy Large One-Piece Base - Nearly 30% larger than the other leading brand. One-piece bas accommodates any boots or shoes without tipping or disassembling while in use. Safe Silent Tough - Safe to use overnight?no moving parts. Constructed of tough rustproof easy-to-clean fire-resistant high temperature ABS thermoplastic.