Michael Phelps doesn’t plan to experiment with any new suits at next week’s U.S. national championships. Other swimmers aren’t so confident they should stick with what they’ve worn in the past.

Last week’s ruling by the sport’s governing body to approve more high-tech suits leaves them with some decisions to make.

Dara Torres expects to try different suits and make a “game-time decision.” U.S. national team coach Mark Schubert said he would advise swimmers to experiment with various options and choose what they feel most comfortable with.

The problem is that...

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