New Balance Numeric 574 Vulc Shoes. The 574 is the most iconic sneaker in New Balance’s storied history. This season we introduce our Numeric version of the 574 which features a vulcanized construction with vaulted heel design that flexes on impact. We’ve reinforced the toe with rubber for durability and added a PU lasting board that sits underneath a molded Ortholite insert for additional step in comfort and support. Leather upper. Vulcanized outsole. Reinforced in the high abrasion areas to withstand the rigors of skateboarding. Lace up closure. Imported.