Regular fit Lace closure Textile lining Torsion System BOOST midsole The Adidas Ultraboost 1.0 X The Hidden Opponent Shoes Are All About Performance. An Adidas Primeknit Upper Provides A Second-Skin Fit, While The Adidas Boost Midsole Gives You The Energy Return You Need To Go The Extra Mile. The Torsion System Adds Midfoot Stability, And The Outsole Grips The Ground, So You Can Focus.