Zumiez Inc. announced that total net sales for the five-week period ended Sept. 29, increased 18.6 percent to $62.7 million, compared to $52.9 million for the five-week period ended October 1, 2011. The company’s comparable store sales increased 5.6 percent for the five-week period, on top of a comparable store sales increase of 10.1 percent in the year ago period. For the nine-week period ended Sept. 29, 2012, the Company’s comparable store sales increased 4.6 percent, on top of a 6.8 percent comparable store sales increase for the same period last year.