Hard Yakka Neo 2.0 Side Zip Safety Boot with Composite Toe Cap - Black Colour:Green HRO (Heat Resistant Outsole) means

HRO (Heat Resistant Outsole) means the sole is tested and certified to resist contact heat up to 300°C

The wide-fitting EE design prevents pressure buildup during natural foot expansion

Removable memory foam cushioned insole for extreme comfort

but does not include a penetration-resistant midsole or water-resistant upper that S3 boots have

Hard Yakka Neo 2.0 Side Zip Safety Boot with Composite Toe Cap - Black Colour:Green HRO (Heat Resistant Outsole) meansHard Yakka Neo 2. 0 Side Zip Safety Boot with Composite Toe Cap is our lightest ever safety boot, featuring a Nano Gravity safety cap (carbon nanofibre). Lightweight Composite Toe Cap "Neo tech" Internal anti debris gaiter REPREVE linings made from post consumer plastic bottles Nano Gravity safety cap (carbon Nanofibre 50% lighter than steel and 40% lighter than composite caps) Lightweight and durable Micro fibre upper Double pull loops for easy pull