I have an issue with displaying product custom attributes. I've read every resources through google but still no success. The problem is that I have to show size attribute of configurable product on category grid and list view. Every solution on google suggested something like

$_product->getAttributeText('size')

but I ended up at just a single string - "S" or "M" instead of an array. How can I fetch all possible sizes of all simple products which belongs to particular configurable product without much hassle?