Kathmandu Holdings said same-store sales rose 1.5 per cent in the 26 weeks to January 26, although margins have declined.
A Kathmandu statement also said it would post a 40 per cent earnings boost for the half-year to January 31, thanks to the A$350 million Rip Curl acquisition completed late last year.
Rip Curl is expected to add at least 10 per cent to Kathmandu's per-share earnings.
Kathmandu is the latest to identify a shift in shopping patterns to the heavily discounted events of Black Friday in November and Boxing Day, saying it experienced low foot traffic in between.
"The Christmas trading period has seen a further shift towards Black Friday and Boxing Day events. Low December market foot traffic between these two events, unusually hot weather, and bushfires in Australia, have combined to moderate first half sales," said chief executive Xavier Simonet.