Introducing the NM600 by Tom Knox. Based on an early '90s NB indoor court shoe from their archives, the Numeric 600 features a FuelCell midsole for a propulsive feel, while the toe has been reinforced with our FantomFit technology for durability and fit. The molded Ortholite insole boosts comfort while the NDurance rubber outsole allows for just the right amount of flexibility and grip.