Leading casual shoe firm Skechers USA Inc on Thursday announced it swung to a loss during the fourth quarter amid weak sales, the axing of its mail order business and the West Coast port shutdown. The California-based company reported a net loss of loss of $8.6 million versus a net profit of $2m in the year-ago period. Net sales slipped 16 per cent to $180.8m from $214.1m, but were still above expectations.