Please hand me my cult card; I own a slanket, and now my friends have experienced it for themselves.
It's the simplest thing, really: a blanket with sleeves. It's been a couch mainstay in cold weather ever since Adam gave it to me last year. My inability to stay warm in the wintertime is well known, and he thought it would work well for his goofy friend who couldn't stay warm but who still wanted to work on her laptop on the couch.