The Eliot Runner
Tracksmith focuses on material 'purity' by using a thick Pebax footbed on top of a Pebax midsole. This 'step-in' quality is superior to shoes that use cheap foam sockliners, offering a more resilient feel over time.
Ingredients & Purity
Features a dual-density Pebax construction. The sockliner is specifically engineered to be 10mm thick at the heel, providing localized cushioning that doesn't degrade like standard foam.
Scientific Evidence
While Tracksmith lacks the massive lab facilities of Nike/ASICS, their use of Arkema-sourced Pebax is a 'gold-standard' material choice for energy return.
Brand Transparency
They are very clear about the materials used (Pebax) and the intent (durability), though they do not publish extensive clinical trial data.
Value Assessment
At $198, it is a premium product. Its value lies in the aesthetic 'classic' design and the high-quality materials that outlast typical mass-market trainers.
Why Not Alternatives?
Mainstream brands often use cheap, die-cut EVA insoles that flatten within 50 miles; Tracksmith's use of a substantial Pebax insert ensures the cushioning remains consistent for the life of the shoe.