You can definitely race in the Adizero SL's, but if you're aiming on running a fast PB-setting marathon, then perhaps consider saving up for the Adidas Adizero Adios Pro 3 (a cushioned carbon-plated competition shoe), and save the SL's for serious training sessions instead.

Adizero Running Shoes Frequently Asked Questions The adidas Adizero Pro includes a carbon plate for a propulsive feel. The Adizero racing line is always evolving, and other shoes in the family use carbon-infusedEnergyrods instead of a carbon plate. The rods are placed from the toe through the midfoot.

The shoe gained around two ounces over last year's version, and instead of Boost, we now have a whole combination of stuff in the 38 mm/31 mm midsole, like Lightstrike Pro, Lightstrike, fiberglass energyRODS, and apparently a carbon plate in the heel which we didn't know about.