NB Numeric 600 X Tom Knox ShoeIntroducing the NM600 by Tom Knox. Based on an early 90’s NB indoor court shoe from our archives,the Numeric 600 features a Fuel Cell midsole to maximize energy efficiency, while the toe has beenreinforced with our Fantom Fit technology for durability and fit. The molded Ortholite insole boostscomfort while the Ndurance rubber outsole allows for just the right amount of flexibility and grip.