The adidas women’s UltraBoost 21 Cold.RDY ‘Crew Navy’ delivers a performance running shoe designed to withstand the elements. Made in part with recycled polyester, the navy-colored Primeknit upper features interior insulation and a water-repellent coating. Neon yellow laces feed through a molded midfoot cage for a lockdown fit, while an external heel counter provides rearfoot stability. Responsive cushioning comes courtesy of a full-length Boost midsole, supported underfoot by a Continental WinterGrip Rubber outsole.