NEW YORK ( TheStreet) -- Skechers is surging, after second-quarter earnings easily topped estimates, swinging to a profit on significantly higher sales.

During the quarter the footwear maker earned $40.2 million, or 82 cents a share, compared with a loss of $5.9 million, or 13 cents, in the year-ago period. Analysts were calling for a profit of 44 cents a share.

Sales at Skechers soared 69% to $504.9 million, driven by strong demand for toning shoes, that claim to work leg and buttock muscles while simply walking.

Shares of Skechers are gaining nearly 8% in after-hours trading to exchange hands at $37.90.

-- Reported by Jeanine Poggi in New York.

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