Geox BALTICBOYBABX1 Waterproof Boot (Little Kid/Big Kid) 100% Leather Synthetic sole GEOX breathes sole technology combines breathability with a waterproof membrane Perforated sole allows air to flow into the shoe with each step while the waterproof membrane allows persperation to flow out of the shoe but doesn't allow water to seep in from underfoot Flexible Sole ABX technology is the new generation of waterproof. Our special breathable waterproof membrane is adheased to the upper or the line of the shoe, preventing water from entering the outerlayer of the shoe