The footsteps ultimate audio pack contains 100+ high quality, professional footsteps sound effects.
It contains footsteps for the following materials:

-Footsteps carpet
-Footsteps concrete
-Footsteps dirt
-Footsteps glass
-Footsteps grass
-Footsteps gravels/pebbles
-Footsteps metal
-Footsteps rock
-Footsteps snow
-Footsteps water
-Footsteps wood

Formats

The sounds are provided in lossless WAV format

You can hear a demo (with a background music) here: Sound Demo

I highly recommend you to use this footstep pack with the Advanced Footstep System script, that allows you to easily define on which type of material your character is walking.