Garnier Olia is an oil powered permanent hair color that leaves hair feeling softer and healthier in addition to coloring it. It is ammonia free and the scent is fairly mild, making to wait while is sits in your hair much easier. I let Monster choose the color I used and she picked a shade close to my natural hair color so I can't speak much for how well it covered but I did have one grey hair in the front that was successfully dyed as I was no longer able to find it.
My hair was much softer and shinier after using Garnier Olia hair color. The 60% oil blend worked hard at restoring damage; a nice change since hair color is usually so hard on hair. My hair remained soft for around two weeks after use.
Disclaimer: I am a BzzAgent and received product coupons, however, all opinions are my own.