Zespri Gold kiwifruit is always ready to eat. 

The Zespri Green is rather firmer when you buy it. Green kiwis kept at room temperature will be ripe in a few days, but you can also speed up the ripening process.

To do so, put the kiwifruit in a paper bag together with other ripe fruit such as bananas, apples, etc. Ripe fruit contains ethylene, a ripening hormone, which will quickly have an effect on the kiwis. Give it a try.