The perfect balance of soft cushion & support to see you through three miles, or 26.2. The new engineered mesh upper maintains the proven fit GTS devotees rely on while integrating a more streamlined look. Refinements in softer cushioning, increased flexibility, & seamless heel-to-toe transitions keep you focused on the run, not what's on your foot. The Progressive Diagonal Rollbar (PDRB) keeps your body properly aligned every step of the way.