EVA foam is a perfectly reasonable choice if you're a casual skier on a budget. It provides consistent cushioning at a lower price point than smart materials like D3O or SAS-TEC, so you can get basic impact protection without breaking the bank.
The tradeoff is that EVA foam doesn't react to impacts the way viscoelastic materials do. D3O and similar smart foams stay soft and flexible while you ski but instantly stiffen on impact, absorbing energy more effectively. EVA just compresses like regular foam, so it's less responsive in a hard fall.
Also keep durability in mind. EVA foam tends to compress and lose its cushioning over time, especially with regular use. If you ski frequently or want protection that lasts multiple seasons, the smarter foams hold up better.
If you're an occasional skier looking for affordable peace of mind, EVA works fine. But if you ski often, are protecting a previous injury, or want the best impact absorption in a slim profile, it's worth upgrading to D3O or SAS-TEC.