What is (Red) and why did Man Utd have it as their shirt sponsor for the Brentford game?

The Independent

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• Manchester United wore a special edition (RED) shirt during their Premier League match against Brentford.
• The initiative aims to raise funds for global health programmes.
• This partnership, involving the club, MatchWornShirt (MWS), and (RED), seeks to transform on-pitch moments into meaningful real-world impact.
• Match-worn, issued, and signed shirts from the starting XI and substitutes will be auctioned to fans.
• The auction for these unique items runs from 27 April to 2 May, accessible via the MWS website and app.