A lot of clients are starting to experience winter dryness. We can use products such as the HydraCalm mask in the regimen to help with this when our other 'tactics' don't quite cut it in helping with dryness and flaking. If there is irritation preventing them from completing their regimen consistently, you can also use the Moisture Balance Toner in place of their regular toner. Do this just in the AM to try and still get that Sal C benefit in there somewhere, if the skin allows it. Try not to do this unless you really need to. Hydrating Rain is another option, this is like a supercharged Hydrabalance, but does come with a bigger price tag.
Other suggestions to help with flaky/dry skin:
Drink LOTS of water
Sleep with a humidifier
Add moisturizer throughout the day, as needed
Add SPF throughout the day, as needed
Add Hydraboost throughout the day, as needed
Reduce caffeine and Alcohol intake