Product second variant shows only first variant's selected options

Store Design
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1

Hi guys!

I have a product (a mattress) wich has 2 variants:

  • Type (single, queen and king size)
  • Size (like 80x190 - 80x200 for the single type, 160x200 - 180x200 for the king size)

What I want to achieve is that when a user selects a type (ie single), the size variant displays only the ones relative to the type selected (ie. 80x190 and 80x200 and nothing else)

At the moment the second variant shows every size. How can I do this?

Thankssss