The Billabong 3mm Furnace boots protect your feet with a partially recycled neoprene blend, flexible sole, and adjustable arch strap. Warmth comes from SMART Foam and graphene insulation, while welded seams and a hidden split-toe design deliver comfort and durability. 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: 3mm 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