Running shoes Adidas ULTRABOOST 21

The Adidas ULTRABOOST 21 is a road running shoe designed as a premium daily trainer for easy runs, long runs, and recovery sessions. It's a neutral shoe suited for runners seeking maximum cushioning and stability in their training miles.

The ULTRABOOST 21 features Adidas Boost midsole foam with 6% more Boost material than its predecessor, delivering soft rear cushioning paired with a firmer, more responsive forefoot. The standout feature is the LEP (Linear Energy Push) Torsion System, a rigid plastic propulsion plate that extends through the forefoot, creating a snappy toe-off and stiffening the ride compared to typical heavily cushioned shoes. The shoe has a highly rockered geometry with aggressive heel bevel and toe spring, promoting smooth heel-to-toe transitions. Best suited for easy and recovery runs in the 6:00-6:30 min/km range, the Adidas ULTRABOOST 21 excels at slower training paces but isn't recommended for faster workouts or race day.

The Primeknit upper provides a sock-like, snug fit that stretches over several runs to accommodate different foot shapes. It's a one-piece construction with no separate tongue, using an external plastic lacing cage that connects to the three-stripe logo for midfoot lockdown. The 3D heel frame sits on the medial and lateral sides of the heel, providing stability without pressure on the Achilles tendon. The upper is low-volume and breathable, though the snug fit may require a break-in period.

The Continental Rubber outsole on the Adidas ULTRABOOST 21 uses a Stretchweb design with thick, tacky crystal rubber at the heel and sides, plus soft blown rubber in the center forefoot for toe-off engagement. The outsole delivers excellent grip on wet and icy surfaces as well as cement and asphalt, making it well-suited for road running in various conditions.

Weight: 360g (EU 42.5)
Drop: 10mm
Stack: 31mm heel / 21mm forefoot
Terrain: Road
Pronation: Neutral