Baby Bogs HooDoo Leather Boot (Toddler) 100% Leather Synthetic sole Shaft measures approximately 5.5" from arch Heel measures approximately 0.75" Boot opening measures approximately 10" around Waterproof leather Cozy, plush lining with Dura fresh bio-technology activates to fight unwanted odors Bogs max-wick moves sweat away and keeps little feet dry Comfort rated from temperate to -32f / -35c* Velcro strap for easy on and off