Wet Leg Became Indie Superheroes Overnight. Now They’re Acting Like It.

Taking the stage in a muscled power pose is a declaration of frontwoman confidence. And Rhian Teasdale is gleaming with it.

When her band Wet Leg played at Market Hotel in Brooklyn this spring, she strode up in a dingy undershirt and some glorified tighty-whities, and flexed her biceps at the crowd — a stance somewhere between bodybuilder and Wonder Woman.

Launching into the come-at-me lyrics of “Catch These Fists,” the pulsing lead single from the band’s upcoming album — “I don’t want your love, I just wanna fight” the chorus snarls — Teasdale, the rhythm guitarist, dropped her custom-made, bubble gum pink instrument, and flashed her guns again. Beside her, Hester Chambers, the college friend she started the band with, was playing lead guitar with her back to the audience (her version of a power move). When they got into “Chaise Longue,” the underground hit that put them on the map, they were both dancing and grinning.

Since Wet Leg emerged three years ago, its trajectory into indie-rock stardom has been a series of almost absurd feats. Pals from the Isle of Wight, England — a far reach from a musical hot spot — the group saw its self-titled debut LP explode, a chart-topper in the United Kingdom that also earned two Grammys. “Chaise Longue,” perhaps history’s catchiest track about a grandfather’s upholstered chair, had vocal fans in Elton John, Lorde and Dave Grohl; seemingly overnight, Wet Leg ascended from dingy clubs to stadiums, opening for Foo Fighters and Harry Styles.

This is a heady place to activate a sophomore album, “Moisturizer,” out July 11. Especially because, unlike the debut, which was mostly written by Teasdale and Chambers, the latest effort is the work of a five-piece — including Henry Holmes, the drummer; Ellis Durand, the bassist; and the multi-instrumentalist Joshua Mobaraki, who is also Chambers’s boyfriend.

And though Chambers, the lead guitarist, is still a full-fledged member of the group, she has stepped back from the sort of promotion she did for the first album, when the two women were featured as soft-spoken musical partners in matching cottagecore dresses. They were billed as a duo, and now, “we’re definitely a band,” Teasdale said decisively.