Tea and blood circulation

I was wondering if anyone knew about tea and possible effects on blood circulation. I suppose it is all related to metabolism, but I was curious anyhow to see if there is any particular type of tea that can especially promote circulation.

I started thinking about this because sometimes my feet become cold during the winter, and at worst I can develop chilblains. This is when your feet are often cold, and there is mild tissue damage, so the toes become swollen and red sometimes.