bt-sonic is truly the only cleansing brush you will ever need, designed by the skin experts at Bio-Therapeutic. It works on ALL skin types and is a staple in the Radiant Skincare treatment room. Features include: - It's waterproof! Keep it in the shower for the whole family to use. - Triangular cleansing head reaches even the hardest to reach contours of the face, delivering results in places round brushes simply can’t go. - Hygienic, silver ion infused Azul silicone bristles deliver cleanse and exfoliate without stressing the skin the way traditional brushes can.