All the products are unfragranced, and silicone, mineral oil and paraben free. 3 More Inches uses cashmere proteins and conditioning agents to repair and strengthen the length of the hair, and there's nothing particularly new or revolutionary in that; protein treatments like Aphogee and Nexxus Emergencee are very popular for helping to fill the cuticle of damaged hair. I do like the 3 More Inches for the fact that it's paraben, silicone and fragrance free, and doesn't appear to contain plastic-y polymers.
You apply the pre-wash treatment to dry hair, and saturate the hair with it from scalp to ends. This is a much more liquid treatment than Philip Kingsley Elasticiser (the Philip Kingsley is more about adding moisture than protein to the hair.) You do get a lot (500ml) for £27, but then you need to use quite a bit to saturate the hair if your hair is long like mine. This is left on the hair for at least an hour, before washing out.
The shampoo and conditioner are also fragrance-free, and washed and conditioned my hair competently. I would have been overjoyed to find these when I was pregnant (I was hyper-sensitive to scents couldn't bear anything fragranced) but if you like a more indulgent hair washing experience, these may not be for you; they are all about the results. These are each £16 for 250ml.
After using all 3 products, my hair feels strong, but not as soft at the very ends as when I use WEN cleansing conditioner. My hair isn't weighed down, it has good bounce at the roots, it's shiny and a day later it doesn't look in need of a wash. My only concern with this range is that is might not be moisturising enough on its own for very dry hair; although protein is strengthening, damaged hair also needs moisture. I can see one shampoo working for all (basically, all I want a shampoo to do is clean my hair without stripping it), but I'm sceptical that one conditioner suits all hair types; I do think thicker/drier hair requires a richer conditioner than fine/oily hair.
There's a finishing/styling product launching in the range in the summer that I think will add the moisture my ends need; until then I'll be using Phyto 9 on the ends. Without any styling/moisturising product, my hair was a little crunchy at the very ends after using the 3 steps.
I'll be using this line without rotating anything else in for at least a couple of weeks before reporting back, but on first impressions, the pre-wash treatment is an excellent protein treatment. I think you could swap the shampoo and conditioner for Louise Galvin's Natural Locks (also protein-based, and silicone, paraben and plasticiser-free) which smell lovely and cost half the price.
Ingredients of pre-wash
Ingredients of shampoo
Ingredients of conditioner