The ULTRABOOST 5X is adidas lightweight revision of the classic UB series. Featuring new Light BOOST material, it saves about 17g compared to previous BOOST while maintaining high energy return. The high-elasticity Primeknit upper, external heel counter, and Torsion system enhance midfoot support and landing stability. Continental rubber outsole provides excellent grip on both wet and dry surfaces, ideal for urban terrain and track training. Breathability is slightly below expectations, but overall comfort is great, suitable for daily jogging and commuting at 5:30~7:00/km pace. Testers note this is one of the most balanced and durable versions of the series, especially for runners who love the UB line but want a lighter, more stable ride.
