The Adidas Ultraboost 21 combines responsive Boost cushioning with a sleek, supportive fit, ideal for long-distance runners and daily training. Engineered for energy return and stability, this model delivers a smooth, springy stride from heel to toe.
**Key Features**
- **Boost Midsole**: High-energy foam for exceptional rebound and all-day comfort.
- **Primeknit Upper**: Adaptive, breathable material for a snug, flexible fit.
- **Stretchweb Outsole**: Flexible rubber sole that adapts to natural foot movement.
- **Heel Fit System**: Secure heel cage for improved lockdown and support.