The Billabong 5mm Furnace boots shield feet from cold waters with warm neoprene and flexible soles. partially recycled exterior and liner materials plus Smart Foam insulation retain heat and provide superior grip and flex. Featured here in the Black colorway. Features • Collection: Wetsuit Accessories collection • Fabric: PRO STRETCH softer, lighter, 100% partially recycled exterior fabric • Graphene, our warmest material to date interior fabric • Neoprene foam type: SMART Foam best thermal retention, partially recycled • Body type: Hidden split toe neoprene boot • Thickness: 5mm thickness • Entry system: Adjustable arch strap entry system • Exterior Seam Detail: 100% welded exterior seams • Flex arch sole design • Lining: Recycler 100% partially recycled jersey and liner made from partially recycled PET plastic bottles