China. According to official website, the State Administration of Marketing, Siro helmet is a helmet brand made in China. The manufacturer is Jiangyin Saiya Home Textiles Co., Ltd., and Siro is the trademark of the company. It has successfully applied to the local trademark office. Jiangyin Mengran Home Textiles Co., Ltd. is a company engaged in textile sales, knitwear sales and other businesses. It was established on September 3, 21 and is located in Jiangsu Province.