I guess the magic ingredients could be the 3 types of natural clays used in this mask. According to the webpage, it contains "white clays (to promote the elimination of impurities), green clay (known for its absorbing and rebalancing properties) and pink clay (known to soften and improve skin’s radiance)."
The blurb on the webpage says: "This mask, recommended for combination to oily skin purifies the skin and ensures a long lasting matte and velvet finish." I'm not sure about the purifying part, as I haven't noticed any improvements to the congested part of my skin. Generally I like to use mask in the evening before I sleep and so far I've never consciously made a note of how long the matte effect last. All I can say is I really, really like the result - look at how many times I used the word "matte"! :)
Verdict: a good mattifying mask.
P.S. For those who are interested in pore-reducing products, try Biotherm Biopur Pore Reducer lotion, it worked wonders on my pores. Obviously the Pore Reducer mask isn't as good as L'Occitane's Rice Mask as I'm not writing about it today. LOL.
Ingredients: aqua/water, kaolin, glycerin, hydroxypropyl starch phosphate, Cl 77891/titanium dioxide, vitis vinifera (grape) seed oil, oryza sativa (rice) powder, sodium pca, sorbitol, butylene glycol, illite, oryza sativa (rice) bran oil, parfum/fragrance, maltodextrin, bentonite ethylhexylglycerin, tocopherol, xanthan gum, red rice vinegar, zinc pca, benzoic acid, dehydroacetic acid, oryza sativa (rice) extract, citrus media limonum (lemon) peel oil, spiraea ulmaria extract, polyamonipropyl biguanide, sodium benzoate, potassium sorbate, phenoxyethanol, limonene.