Adding a variant title

[ffindlater]

Hi all, I've got a few products that have different variants - i.e. Colour, Size, etc. 

I'm trying to output the parent(?) variant title using - {{ variant.title }} but that's only outputting the variant options themselves  i.e. Small, Medium, Large for Size.  Is there a way to output the "Size" title and not the individual variant titles. 

Sorry if that's confusing!