Tea-cozy of +4 wellness

Hey!
So, a while ago I was wandering around Ravelry and came across a design for a tea cozy. (The Ravelry link is here, but needs some logging in.) It was designed and made by crocheting-mathematician Cayenne.
It's a tea cozy of +4 wellness. After all, tea cozies are pretty cool, but surely a tea cozy *and* +4 wellness has to be even better? I'm not really a role-playing geek myself, but I really like the idea of taking objects and unilaterally assigning them special powers. I am, however, a tea-geek, and hoping that a good warm tea cozy will make it possible to keep a pot of tea nice and warm through a good long afternoon of maths.

The original tea cozy is crocheted, but I'll make a knitted version instead - because it's symmetric the shaping should be quite simple. And I'll add a little button flap to open and close it, if only because I'm enjoying making buttonholes lately.

And thanks to Cayenne for letting me borrow the idea!
Hugh.