Merrell Vapor Glove 4 Women's Training Shoes Monument : The Merrell Vapor Glove 4 training shoes continue to provide that ultra-connected training experience minimalists know and love. Total ground contact offers excellent freedom and quickness during movement. A Cordura mesh and lightweight TPU material on the upper provide comfortable durability around the foot. The Vibram TC5+ outsole is made from a premium rubber compound that has superior traction on both we and dry surfaces. Upper: Cordura Mesh and TPU upper provides breathable flexibility. Hyperlock TPU film heel counter adds security. Midsole:Merrell Barefoot 2 construction provides enhanced proprioception and stability during variable movement. Features an integrated insole. Outsole: Vibram TC5+ is an advanced rubber compound that provides excellent traction on both wet and dry surfaces in even the most extreme temperatures.