The adidas Women's Ultraboost 21 Cold.RDY Running Shoes are a winterised version of the classic built for cold-weather performance. Offering a sock-like fit thanks to the stretchy and breathable Primeknit+ upper with added insulation, padded collar and integrated tongue, while a heel counter and supportive midfoot cage provide security and a precision feel. The midsole has more boost than its predecessors - cushioning impact shock for an incredibly comfortable ride and working in synergy with the LEP Torsion System to give a stable transition through to a high energy toe-off. Finally, an updated Stretchweb outsole with Continental™ WINTERGRIP™ Rubber ensures long-lasting durability and grip in wet and cold conditions.
With 6% more Boost capsules present in the midsole, this current iteration in the Ultraboost series creates a softer underfoot feel that explodes with forward propelling energy.
Delivering incredible energy return, the LEP Torsion System supports the midfoot for a smooth transition and provides a 15% increase in forefoot bending stiffness for a more responsive run.