This soap available at Cachette is made entirely from natural, vegetable ingredients, and is based 72% on oil from the Provence, which makes it gentle on your skin, but also great for washing textiles.
At first I thought the brush is intended to help exfoliating the skin, but it actually is for removing stubborn stains on your clothes. Only the soap part is what you should use to wash your skin. The design also allows the brush to have a stand if you sit it on the soap cube.
Cachette sells this French soap with integrated brush for EUR 13.50.