First Down White...
Is a high solids acrylic (similar to supercover white, but with less body) and designed as a white underbase for your Permatone and Standard range of Permaset inks.
So you can print with those 2 ranges of colours onto dark coloured fabrics with this white as a base.
And it will give a softer "drape" compaired to the std or classic supercover white as well.