Running shoe durability hinges on outsole rubber type, foam lifespan, and mileage. Durable carbon rubber in outsoles, especially black, outlasts softer variants. Full coverage and thick layers boost wear resistance, while midsole foam’s performance diminishes with miles. Environmental factors like UV exposure and humidity accelerate wear. Replace your shoes every 300-500 miles, or when you notice signs like outsole wear or midsole creases. Knowing this helps you pick footwear wisely and uncover more insights.