adidas Ultraboost Light Running Trainers Womens The adidas Ultraboost Light Running Trainers will have you sprinting past finish lines. Developed with a breathable Primeknit+ upper that wraps around the foot like a second skin, the supportive heel counter delivers a secure and comfortable fit to reduce irritation allowing you to focus on your personal best. The unrivalled Boost midsole works by capturing the energy you put into running and blasting it right back out for excellent responsiveness whilst the trainers are finished off with a Continental rubber outsole.