boost's energy-returning properties keep every step charged with an endless supply of light, fast energy
Engineered mesh upper with various types of mesh in different areas of the foot; Seamless and stretchy Primeknit forefoot adapts to foot's natural expansion and helps reduce irritation
Bootee construction for comfortable fit; Featherweight sockliner adapts to the foot for customised fit and feel; TORSION SYSTEM for midfoot integrity
Highly elastic, snug-fitting heel with external heel counter for natural Achilles movement, stability and comfort
Energy-harnessing stretch web outsole adapts and stretches with your foot strike and movement
