Men\'s shoes. Suede & Textile Uppers. Fulcrum Technology. Rubber Outsole. Stylist Notes. This season, Karhu is showcasing their newest Fusion XC trainers. These grey-coloured shoes combine an outdoor edge with a nostalgic style thanks to their suede and mesh uppers. A sticky rubber outsole provides the best traction, while fulcrum technology ensures a bounce with each stride thanks to its installation in the midsole.