Blackrock Rigger Safety Boot Colours Available Black or Tan Sizes Available 5 - 13 BUILT TO WORK: Steel toe cap protects against impact from falling objects and against compression, giving 200 Joules of protection - equivalent to dropping 20kg from a height of 1m or a weight of 1.5 tonnes resting on the toe area PROTECTION FROM BELOW: Steel midsole - a thin yet strong steel plate that runs the length of the sole and protects against objects penetrating from below and piercing your foot, such as nails, tacks, glass shards and more, that could otherwise cause a potentially serious injury DURABILITY: Dual density PU/PU sole that is resistant to fuel oil, so it won't degrade, stain or retain grease that would otherwise cause slips and trips SAFETY FEATURES: Other .