Asolo's classic backpacking boot gets an upgrade. A new TPS sole designed in collaboration with Vibram enhances the Triple Power Structure technology that makes this boot a reliable favorite. A dual density PU midsole is injected directly onto the rubber outsole to make a single element sole that will withstand even the toughest treks for years to come.. . Heavy duty, water resistant, full grain leather upper with Gore Tex lining guarantees waterproof and breathable protection from the elements. TPS high and low density polyurethane midsole incorporates three shock absorbers to improve comfort under areas of the foot that receive high impact during activity. AsoloVibram rubber outsole has a strong, versatile grip. Asoflex shank provides underfoot stability. Ideal for hiking with a heavy pack over uneven ground.