FBuoyancyMultExtremity
All of the FBuoyancy settings control the buoyancy (how fast or slow an object will sink when dropped in a pool of water) of some type of material in the game. A setting of -1.000 means the material will sink immediately to the bottom of the water. A setting of 0.000 means the material will slowly settle into a mid-level height in the water. A setting of +1.000 means the material will float on top of the water. Other values control the speed at which the material will sink and the height at which it floats.
The FBuoyancyMultExtremity function controls the buoyancy of player and NPC body extremities (hands and feet). For realism, set this value a bit lower than the main body buoyancy of FBuoyancyMultBody so that the hands and feet dangle below the torso.