Essentially a Twin Kit is two waxes, in this case a 200ml of Amalfi and a 200ml of Heather.
Amalfi is known for it's super high gloss qualities and Heather is known for it's heavy duty winter capabilities.
The beauty of this kit is you can layer the waxes, i.e. 2 x base layers on Heather and 1 x layer of Amalfi.
This gives you the piece of mind that Heather is giving you lots of protection and Amalfi is still providing the high gloss that you want.