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2021
Adidas UltraBoost 21 Cold.Rdy 'White Signal Green'
The adidas UltraBoost 21 Cold.Rdy ‘White Signal Green’ showcases fluorescent accents on a performance running shoe made for the cold-weather months. Made in part with 50% recycled materials, the white Primeknit+ upper features no-sew overlays and a molded heel counter with UltraBoost branding in embossed green lettering. The sock-like build is lined in insulated black textile and accented with a neon green pull tab at the heel. A metallic teal hue is applied to the stacked Boost midsole, supported by a Continental WinterGrip Rubber outsole.
| Release Date | 10-31-2021 |
| SKU | S23898 |
| Nickname | White Signal Green |
| Colorway | Crystal White/Core Black/Signal Green |
| Main Color | White |
| Upper Material | Primeknit |
| Technology | Boost |
| Category | Running |