DOT Mercury SMS Safety Boot. The Mercury SMS is the Ultimate Multi-Purpose safety boot with a dual density sole, offering increased comfort and all-round protection. Also including a steel-midsole for anti-penetration. CE EN ISO 20345 Approved. Steel Midsole for Anti Penetration. Oil Resistant. Lightweight and flexible Dual Density PU Sole. Steel Toe Cap with Impact Protection of 200 joules. Heat Resistant To 90 Degrees Celsius. Stylish Design. Slip Resistant. Genuine Split Buffalo Leather Upper. Shock Absorption Heel. Removal Comfort Inner Soles. Wider Cut for Added Comfort. Available in Sizes 3-13.