Online fashion phenomenon Asos (LON:ASC) forecast sales at the top end of hopes after a strong performance, particularly in mainland Europe.
Asos, which has faced challenges including a fire in its Barnsley warehouse last year, said group retail sales at constant currencies rose 24% to £386mln in the four months to June 30 against a year ago. In real terms, sales gained a fifth.
UK sales lifted 27% and international sales increased 23% at constant currency. Finance chief Nick Beighton said the group was "pleasantly surprised" with the UK growth.
But he noted that it was down from 44% growth last time and said it would be difficult to keep up the pace.
"We can't see it growing at 27% in each of the next five years," he said.
Asos said it was increasing guidance for full-year pre-tax profits by about 4% to £47mln.
Within international, European Union sales gained 37%, US sales were up 31% and rest-of-world sales rose 4%.
International sales made up 59% of the group's total, a slight fall on last year's 61%.
The group increased customer numbers by 11% to 9.7mln year-on-year. Total group revenue gained 24% to £396.7mln.
Chief executive Nick Robertson said discounts and promotions helped underpin international sales growth despite the strong pound.
He said: "We anticipate full year sales will be at the higher end of our guided 15-20% growth range.
"We have increased investment in our people and our customer proposition, particularly in relation to free returns trials. We therefore expect EBIT margin to remain at the guided level of circa 4%."