| Model | adidas UltraBoost 21 |
| Known as | "Grey Sonic Ink" |
| Brand | |
| Release date | August 30, 2021 |
| Colorway | Grey Five / Core Black / Screaming Green |
| Colors | Gray, Black, Blue, Green |
| Style code | S23871 |
| Rating | |
| Type | Original, General Release |
| Gender | Men's |
| Sport | Lifestyle |
Added June 11, 2025 at 1:37:17 PM
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