Nike Dunk Low NN Mens Trainers FZ4621 Sneakers Shoes (uk5.5us6eu38.5, irongreyphotondust001). These iconic Nike Dunk Low Next Nature trainers in a sophisticated 'Smoke Grey' colourway offer a blend of classic style and modern comfort. Crafted with durable leather, they are designed for adult wear. The FZ4621-001 model, part of the esteemed Dunk series, features a UK size 5.5 (US 6, EU 38.5).