The New Balance 57/40 “Incubation Pack” is a grey-based colorway of the hybrid shoe by New Balance that gives a contemporary look to the New Balance 574. Based on the 574 model, the 57/40 debuted in 2020 and has several design elements that give the shoe a futuristic look that still honors the original 574 shoe. The “Incubation Pack” colorway is mostly grey in appearance, as it features a light grey mesh base and dark grey suede on the toe cap, forefoot, and eyelets.