Again, lighter tires have pros and cons and it all comes down to the trail you're going to ride. At the end of the day, if you're not Nino Schurter, there's no need to fit 500g tires, as there is always a trade-off and more often than not it ends in a disappointing flat.
The average weight of a good XC tire is 700g — these options have been designed to deliver the best all-round compound to stave off punctures, improve grip and prioritize rolling speed. Of course, you can pick up some really impressive options that weigh even less but we recommend erring on the side of caution — nobody enjoys walking the bike back to the car park.