A couple of strong performing commodity ETFs this year are pulling back today, as light volume trades are affecting the prices of these ETFs. iPath DJ-UBS Coffee Subindex Total Return SM Index ETN (NYSE:

) is down 76 cents to $62.29, a loss of 1.2%, while shares of iPath DJ-UBS Cotton Subindex Total Return SM Index ETN (NYSE:

) is really pulling back, as it'soff almost 5% today. Nike (NYSE:

) recently spoke about the sharp increase in cotton prices during its latest conference call, and said it may have to raise prices in order to keep up with rising input costs, namely cotton.