A positive swing of one billion yen (€7.6m-$8.8m) in foreign exchange translations helped Yonex to triple its net profit to ¥1,338.8 million yen (€10.1m-$11.8m) in the first half to Sept. 30, despite a contraction in the gross margin of three percentage points to 41.8 percent due to changes in the product mix and higher input costs. Sales rose by 2.9 percent to ¥32.2 billion (€243.8m-$284.2m), Yonex reported, indicating that sales were stable in the domestic Japanese market, while new product introductions are fueling higher demand for its badminton and tennis equipment in Europe and the U.S.