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I'm not sure i buy into this compressed size bull. But you know, cant argue with science. However, as for their effectiveness, i can say they are not as effective as Nivea invisible black and white or Mitchum which do a better job. i found that there was a very slight whiff of sweat which though not a disaster it makes me uncomfortable. It does not keep you dry or smell free for a 12 hour period. about 4 hours in on a warm day and you need to top up.