Footbalance Dynamic Blue Insoles (Courtesy Photo)
Patagonia Advocate Lace Plaid (Courtesy Photo)
Darn Tough Vermont Light (Courtesy Photo)
Midsoles—which layer various combinations of materials that are glued, injected, or heat-bonded between the sole and upper—are the heart of any boot. Foam-like EVA (ethylene vinyl acetate) is springy for supreme cushion. PU (polyurethane) is a denser, more durable, and more supportive foam. TPU (thermoplastic urethane) adds even more stiffness and structure.
Boost wet weather performance
Treat your boots once a season with Nikwax Fabric & Leather Proof ($9; nikwax.com).