The stock was rising 3% to $194.02 in after-hours trading, after having gained 4.3% in the regular session.
GAAP earnings per share for the second quarter came in at 96 cents, beating Wall Street estimates of 89 cents.
Sales were $883.4 million, beating analysts' expectations of $846 million. Sales grew 22% year over year. Same-store-sales growth was 15%, beating estimates of 12.2%.
"We continue to make progress in delivering against our Power of Three growth pillars - product innovation, omni-guest experience, and market expansion," CEO Calvin McDonald said in a statement. The company sees "significant runway in front of Lululemon," he said.
Management guided for full-year 2019 revenue to range $3.8 billion to $3.84 billion, up from a previous expected range of $3.73 billion to $3.77 billion.
Earnings are seen between $4.63 and $4.70 a share, up from a previous range of $4.51 to $4.58.
The stock is up 53% year-to-date.