Endless energy for hiking trails and streets. This hip casual boot makes comfort and warmth easy with boost energy-return comfort and PrimaLoft insulation. Extraordinary Continental rubber outsole grip. Upper: Primaloft 100g insulation material for more warmth, even in wet conditions. Midsole: Lightweight EVA midsole for long-term cushioning. Midsole: Boost offers endless energy in the mountains and high adaptability on rocky surfaces. Outsole: Continental rubber for extraordinary grip. Material: Textile, Rubber.