I'm sure several of us have ran around the house with socks on and tried to slide on wood or smooth floors.
Using what we know about friction, we can see that the equation is the coefficient of friction times the normal force, or mg. Since we are on earth, there is obviously a force from gravity and a person has mass. Therefore, the explanation for this fun trick must lie in the coefficient of friction. Since you can slide a decent distance, the coefficient must be small, therefore causing the whole force from friction to be small as well.