Can I use a touring helmet for resort skiing?

Yes, but it won't be as comfortable as a dedicated resort helmet on cold days. Touring helmets have minimal insulation and extensive ventilation, so you'll likely need a thin beanie underneath for warmth on chairlift rides. On warm spring days, a touring helmet at the resort is actually quite comfortable. If you split your time roughly 50/50 between resort and backcountry, consider whether the weight and ventilation benefits of a touring helmet outweigh the warmth penalty on cold resort days.