The unspoken question here is: How long do running shoes last? The generic answer: Six months, depending of course on how many miles you run each week, your weight, the terrain, and so on. Most running shoes still use EVA as the primary cushioning layer in the midsole, and the stuff just isn't that durable. It will look fine for years, but its cushioning greatly dissipates in that six-month span for most people. Polyurethane is more durable, but less cushy. Air inserts, gel inserts, and other proprietary gadgets work well, but still are typically encapsulated in EVA or something similar.
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Filed To: Road-Running Shoes