Nike PG 4 EP 'PCG-String' Zip-Up Multicolor Synthetic Mens Trainers CZ2241_200. These trainers feature a unique zip-up design and are made from synthetic materials. The 'PCG-String' colorway offers a vibrant multicolor look. Designed for adults, these Nike PG 4 EP trainers are a stylish and comfortable choice. MPN: CZ2241-200, Series: PG.