New to me - Lawn, Root Zone ?

I have just found a large aggregate company about 3 miles from me . They do sell to Joe public. Looking through the product list they have "Root Zone " , now I have never heard of this. It seems by googling it's a lawn top dress mix. Has anyone used this ?

 

*BUMP*
Has anyone used "Rootzone" ? Or is this a new first for GC

 

Hi Harry, we have used rootzone, loam/sand mix, very free draining and almost stoneless. Mixed with a little "fine" compost, it makes a good seed sowing mix. Lawn dressing seems a good use for it too (but not having a lawn?)