MANHATTAN BEACH, Calif.--(BUSINESS WIRE)--SKECHERS USA, Inc. (NYSE:SKX), a global leader in footwear, today announced financial results for the first quarter ended March 31, 2015. First quarter 2015 net sales were $768.0 million compared to $546.5 million in the first quarter of 2014, an increase of 40.5 percent. Gross profit for the first quarter of 2015 was $332.5 million, or 43.3 percent of net sales, compared to $240.4 million, or 44.0 percent of net sales in the first quarter of 2014. Earn