By "hardware store" I had several products in mind: adhesive wrap-on fibreglass & foil (integral seam tape, bulky, ugly), bubble-cell foil (ineffective but looks space-age), and the pool noodles (neat, until you deal with the gaps and sharp bends). The pool noodles (closed cell foam tubes) around here are scored so they can be put on either way.
Anyway, it's all fluff essentially and puffin down would serve as well. The primary thing is to form an airtight barrier so atmospheric moisture can't migrate to the cold pipes. That's best accomplished with lots of sticky tape.
A snackfood packet of silica gel in there wouldn't hurt.
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