Simulate how cleat stud configurations, soil rootzone shear strength, Clegg Impact Values (GMax), and moisture levels alter footing stability, cutting slip distances, and torque stress during live game action.
When the NFL transitions games to international soccer pitches like Rio de Janeiro or São Paulo, grounds crews oversee turf overseeding, aeration, and Clegg impact testing to match standard US hybrid surfaces like Heinz Field or Lambeau Field.
Traction requires balance: too little shear resistance leads to the severe slipping seen in São Paulo 2024, while excessive traction (> 70 Nm) locks the foot into the turf, transferring dangerous rotational torque to the player's knee (ACL) and ankle ligaments.
Field Directors deploy the 2.25 kg Clegg Impact Hammer and rotational shear vanes. Moisture is kept between 20–26% to ensure ryegrass roots lock with the sand-capped sub-base without turning slick under heavy 300-pound offensive line scrums.