Red Pirates are always wearing shoes for their armor slots.
This is a Reference to Char Aznable from the Original Gundam Series. Due to the fact that his mobile suits are always 3x the speed of a regular mobile suit. In this case, 3x the walking distance of a regular monster for the Red Pirates due to being equiped with three types of random shoes.
The Red Pirates Crew are often the red color of the Monsters' tier class.