MUI MOI Lightweight Rain Boots Pansy Waterproof Long Boots Black 21cm Synthetic Leather, Synthetic Sole Antibacterial agent used in the insole: organic. Elastic opening. Not used much because the size was quickly outgrown. Please check the condition of the soles in the images. Thank you for your understanding regarding used items. Please refrain from purchasing if you are sensitive to details or have any concerns. Will be shipped via standard mail in simple packaging.