Altessa Grid Fabric - 99% Polyester / 1% Carbon|Color coded webbing across toe with strap|Webbing around ankle with side release buckle closure|1" elastic & webbing top closure with snap adjustment|X-Stat ESD sole twill reinforcement|Upper is sewn on with conductive thread|Meets standards required for use in ISO 5 (Class 100) - ISO 8 (Class 100,000) cleanrooms and other controlled environments