What is the matephor for soft?
I assume you are looking for a 'metaphor' for soft. There could
be any number of metaphors you might use to describe how soft
something or someone is. Here are a few examples: Kitten soft -
which you might use to describe a scarf or some other luxurious
item of clothing. Rather unkindly people are sometimes described as
being 'soft as sh*te', or perhaps less offensively ' as soft as
butter'
Perhaps more poetically you could describe a touch as being 'as
soft as an angel's kiss', or 'as soft as angel tears'.
You might hear someone talk about 'a soft option' in which case
the word 'soft' itself becomes the metaphor to help clarify the
quality of the option.
Basically if you can think of something which has a soft quality
such as marshmallow, duck down, water from a mountain stream, a
piece of music, a whispy cloud, etc. you have the basis of a
metaphor.