Blundstone - Chelsea Boots #2055. Rustic Black. All Terrain. Men's AU 9 - equivalent of a US Men's 10 - 10.5. All Leather upper. Comfort shock protection system sole. SPS x-tra. Oil and acid resistant. TPU Outsole. PU Midsole (I have no idea what any of that means except they are solid). This is the description from the Blundstone website: Featuring a water-resistant leather upper construction, the Blundstone® All Terrain Chelsea Boots offer a sturdy design with dual pull tabs and side gore panels. These pull-on boots have XRD technology in the heel that offers shock absorption and easily grooves to release mud, snow, and small stones that come across the path. Leather lining and removable, cushioned insole with arch support. Blundstone recommends ordering a half size up for a Wide fit. Round toe design. Rubber outsole. Imported.