Works great!  I've been using this brush to clean my Uggs and Campers, as well as my son's Timberlands and have had no issues with damaging the material of the shoes. I would definitely start out with a light hand and work your way up in pressure. I just purchased my mother one for her shoes so that she could experience the greatness of this brush!  I also love the thinner parts/brushes on the sides of the brush for the creases and edges in the shoes/boots.  All in all, for the price, this is an excellent brush!