The Southern Cross Zip is available with a composite cap but what’s the difference🤔?   Composite cap: 🔹The cap is made from fibreglass 🔹The materials can be x-rayed 🔹Fibreglass allows for good insulation from heat and cold   Steel cap: 🔸Made of carbon steel 🔸Cannot be x-rayed 🔸Poor insulation to heat/cold