The LEGO x adidas UltraBoost 21 J 'Red' is part of the children's 'Color Pack', a collection of UltraBoost sneakers that draw inspiration from the renowned Danish toy maker. Exhibiting a straightforward two-tone color scheme, this particular iteration combines white textile with vibrant crimson accents on the signature three-stripes and heel counter. These visual elements showcase a textured studded pattern reminiscent of the beloved LEGO bricks. Furthermore, the full-length Boost midsole receives a matching red coating, while the underfoot support is provided by a black Stretchweb outsole featuring Continental rubber for enhanced traction.