The shoes that redefined cushioning when they launched. These men\'s running shoes blend a flexible, adaptive techfit® upper with the plush, energy-filled ride of boost™. The result is a lightweight, neutral running shoe that will invigorate runners of every level, at any distance.. TECHFIT personalized fit through a foot-hugging textile with zoned elastic support.. BOOST ultra responsive comfort and cushining combined with unmatched longevity in every climate. stores and unleashes energy every time the foot hits the ground. TORSION SYSTEM a system that moves with the foot for a smooth, supportive transition from landing to push-off..