The Parley x adidas UltraBoost 21 ‘Black Grey’ delivers a stealthy colorway of the lightweight performance runner. The form-fitting upper features Primeknit textile construction built with 50% Parley Ocean Plastic and 50% recycled polyester. An UltraBoost wordmark is embossed on the external heel counter, while dual adidas and Parley branding adorns woven pull tabs at the tongue and heel. The sneaker rides on a full-length Boost midsole, painted black and supported by a Continental Rubber outsole.