Footwear: Protection From Multiple Hazards
Safety footwear is designed to protect against foot hazards in the workplace. Safety footwear protects against compression, puncture injuries, and impact.
Safety footwear is divided into three grades, which are indicated by colored tags and symbols. The tag color tells the amount of resistance the toe will supply to different weights dropped from different heights.
The symbol indicates the strength of the sole. For example, a triangle means puncture-resistant sole able to withstand 135 kg (300 ft. lips.) of pressure without being punctured by a 5 cm (2 inch) nail. See Canadian Centre for Occupational Health and Safety. For more information, look at Alberta's O. H. & S. Statute and Regulations or CSA Standard "Protective Footwear" 2195-M1981.
In construction, it is recommended that only the green triangle grade of footwear, which also gives ankle support, be used. You choice of protective footwear should always over protect, not under protect.