Dual-layer foam is a solid choice if you're a casual to regular skier who spends a few days on the mountain each season. It uses two densities of foam to balance comfort with affordability, and it'll keep a decent seal against your face without the premium price tag.
The main trade-off is long-term durability and moisture management. Dual-layer foam tends to compress over time faster than triple-layer options, and it doesn't handle sweat as effectively. If you ski hard all day or tend to run hot, you might find it gets damp and less comfortable during longer sessions.
For weekend warriors and budget-conscious skiers, dual-layer foam gets the job done. Just know you may need to replace your goggles sooner as the foam wears, and always avoid storing them in hot cars—that speeds up foam breakdown significantly.