Can a Shoe Color Really Be Trademarked?
Why footwear has far more to do with identity and expression than mere function
Christian Louboutin on Cardi B and His 'Red Bottoms' - The New York Times
Christian Louboutin faces setback in fight to trademark red sole, Luxury goods sector
Christian Louboutin Wins Legal Battle Over Signature Red Soles – Sourcing Journal
Trademark protection of color: Louboutin's red-soled shoe is a clever logo
The True Story Of How Christian Louboutin Shoes Got Those Trademark Red Soles
How Christian Louboutin's red soles paint the full picture of femininity
Why do Louboutin high heels have red bottoms? - Quora
Christian Louboutin scrambles to trademark his red-soled shoes