Online fashion retailer Asos is proving resilient to the slowdown in consumer spending after posting a 68% jump in first-half pre-tax profits on sales that more than doubled.

The firm today (17 November) said its profit before tax climed to GBP4.1m (US$6.16m) for the six months to 30 September.

Sales rose 107% year-on-year to GBP65.7m, helped by a 238% rise in the number of products on sale. Asos now offers more than 19,400 lines, and has increased the number of brands sold by 135% to 700.

The number of active customers is up 95% year-on-year to 947,000, and unique visitors are up 93% to 4.5m.

International sales for the first half were up 252% to GBP11.4m

Asos chief executive Nick Robertson said the company was "convinced" that international expansion was a huge growth opportunity.

As a result, Jon Kamaluddin, the current finance director, has been appointed to the position of international director. Kamaluddin will continue in his existing role until a suitable replacement is found.

In its outlook Asos said that its sales for the seven weeks to 16 November were 104% ahead year-on-year.

But a statement added: "We face tougher second half comparables and need to trade through the all important Christmas period. We view the coming months with cautious optimism."