See Kai Run Atlas Waterproof/Insulated Boot, Gray/Blue *Company recommends sizing up 1 size for best fit on this style* Ready for outdoor fun, these sturdy winter boots for boys feature a waterproof insulated design for all-weather wear, and a light durable outsole, perfect for gripping rough terrain. Nylon textile and rubberized PU upper is waterproof, lightweight and flexible Seam-sealed, waterproof membrane construction, resistant to 10,000mb pressure/4 hours; water gusset keeps water and debris out Features 3MTM ThinsulateTM thermal insulation layer, delivering 360-degree insulation Fleece lining and thermal sockliner for an extra layer warmth and comfort Deep lugged TPR rubber outsole built for maximum grip on wet and snowy terrain Double hook and loop straps allow for secure fit and custom adjustability Rubber toe cap adds durability and protection Awarded the Seal of Acceptance from the American Podiatric Medical Association (APMA)