Safety Boot. Apache Mercury Boot. Apache Non-Metallic Stone Waterproof Boot. Mercury Stone from Apache - the ultimate safety boot for tradespeople. This boot is 100% non-metallic, featuring a composite toe cap and composite midsole protection. The Mercury Stone is a versatile and reliable waterproof safety boot, perfect for a wide range of outdoor applications. The Apache Mercury Boot includes: Scuff cap for added durability Boasts the highest slip rating certification Waterproof and breathable inner liner Thinsulate insulation keeps your feet stay dry and comfortable Phylon/rubber outsole certified for heat 7 oil resistance up to 300 degrees celsius Resistant to fuel oil Standards & Certifications: CE EN ISO 20345:2011 Safety Rating: S3 WR HRO