Setup, Compatibility & Care
To ensure your New Balance 603 trainers last, avoid submerging them in water or using harsh detergents. If the shoes become dusty or dirty, use a soft-bristled brush to remove dried debris. For surface stains, spot clean with a damp cloth and mild soap, then air dry away from direct heat sources like radiators, which can warp the materials. Compatibility-wise, these trainers feature a standard UK size 4 fit, making them suitable for everyday socks; if you wear thicker orthopedic insoles, you may find the fit becomes slightly tighter.