Frustrated by their failure so far to win a medal in speedskating, a sport that produced four U.S. medals four years ago, the Americans have changed their suits.

The team ditched the suits it wore in the first six events in Sochi -- in which no American finished among the top five -- and will wear earlier versions made by the same manufacturer, Under Armour.

The suits the Americans now will use are the same ones they wore at last month's World Cup in Japan. They are different from the newer suits in that they don't have venting in the back or the flow molding meant to give skaters an advantage by helping their bodies better cut through the air.

U.S. Speedskating president Mike Plant said the move will not affect the team's partnership with Under Armour.

"Under Armour provided US Speedskating with three different suit configurations in advance of Sochi, and we have full confidence in the performance benefits of each of them," Plant said in a statement. "We are constantly evaluating all aspects of race preparation and execution to help our athletes improve their output and maximize their physical and psychological advantages. Under Armour's mission is to make all athletes better, and they are working tirelessly with Team USA to ensure each athlete steps on the ice with 100 percent confidence so they are positioned to capture a spot on the podium. US Speedskating is proud of its long-term, successful partnership with Under Armour, and we all look forward to the upcoming races."

The International Olympic Committee had approved the U.S. team's request to wear the older Under Armour suits.