SPERRY TOPSIDER. STS84506. MARITIME REPEL SUEDE BOOT. GREY. Fashion meets function with this re-imagined duck boot. Waterproof leather upper keeps the weather out and heat in. 200G Thinsulate insulation keeps you warm on the coldest days. Rubber lower allows you to trudge through snow and slush. Small heal creates a just-right wearable lift. Rubber outsole inspires confidence with each step.