The adidas UltraBoost 21 ‘Triple Black’ delivers a stealthy iteration of a performance running shoe that takes advantage of more Boost cushioning and a more responsive ride than its predecessor. A flexible Primeknit upper, incorporating Parley Ocean Plastic and other recycled materials, sits atop a black Boost midsole that packs 6% more Boost capsules. Underfoot, Linear Energy Push technology provides 15% more forefoot stiffness to produce improved energy return with each step.
| Size | 3, 3.5, 4, 4.5, 5, 5.5, 6, 6.5, 7, 7.5, 8, 8.5, 9, 9.5, 10, 10.5, 11, 11.5, 12, 12.5, 13, 13.5, 14, 14.5, 15, 16, 17, 18, 19, 20 |
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