Mud Patches
From WikiRaider
Mud Patches can be found in muddy spots throughout {{sottr}}. Lara can cover herself with mud to blend in with her environment. This wax she is able to sneak up stealthily on her Enemies as well as Animals living in the Peruvian Jungle.
PRESS to cover Lara in MUD. MUD makes it harder for enemies to spot her, especially when concealed.
Shadow of the Tomb Raider, On-screen info, PS4 version
Lara can cover herself in MUD to blend with the environment and SURPRISE her enemies.
Shadow of the Tomb Raider, On-screen info