The brush is made of silicone, really soft, gentle and smooth on your skin but also dispenses shampoo.
Add 1 part Shampoo = 3 parts water inside reservoir 
Silicone is super easy to clean when it gets dirty. 
Silicone is strong enough that it can even be boiled clean.
The comfortable size and shape make it fit on your hand easily and can hold a lather really well.