Gladbacher Spinnstoffindustrie Mühlen GmbH – GSM for short – located in Mönchengladbach in the Lower Rhine Region of Germany, can look back on a proud 121-year company history. In addition to the company's core business of processing chemical fibres, GSM has successfully been developing and producing various additives for riding sand for over 20 years. The products GSM offers, which are used in the construction of German and international riding arenas, quickly became top sellers.