Beer Can Adapter

So here in New Zealand we have a company "Husky" the supplies Double walled stainless steel tumblers and coolers. www.husky.co.nz
This Christmas I got some wine tumblers V2.0 for myself and my sister.
They're great products as you can use them with or without the removable stem as a beer tumbler or with the stem as a wine glass.
Today I had an epiphany, and with this adapter you don't have to pour the beer into the tumble and can use them as a beer cozy.