If one-size balaclavas feel snug on your head or come up short on your neck, an L/XL is definitely worth seeking out. Most balaclavas use stretch fabric to fit a wide range of heads, but when you're on the larger side, that stretch works against you—the material pulls thin, coverage shrinks, and the balaclava can ride up throughout the day, leaving gaps where cold air sneaks in.
An L/XL gives you proper coverage without over-stretching, so the fabric maintains its full insulating and wind-blocking performance. You'll also get more neck length, which means the balaclava stays tucked into your jacket instead of pulling free when you turn your head. That seal is key for resort skiing where you're moving all day and need consistent protection from wind and cold.
If standard sizes have left you constantly adjusting or feeling pinched, stepping up to L/XL makes a real comfort difference on the mountain.