Search:

Yes

But also you could create backbone by sinking the knot lower

Backbone is a equation of Density (amount of hair in a given knot size) and Loft (height of knot above the handle) so it can be...

Backbone is separate from "Softness"

Softness at least in my mind is how the tips feel on the face. Backbone is the density of the knot in relation to the loft,, ie: how easily the brush bends
...