Foam choice determines how a case absorbs impact. Three materials dominate, each with different feel and performance.
EPE (polyethylene foam)
Flexible, lightweight, common in gig bags. Good vibration damping. Density 20-40 kg/m3 typical.
EVA (ethylene-vinyl acetate)
Firmer, better impact resistance, shapes well. Used in semi-hard and premium interiors.
EPS (expanded polystyrene)
Rigid, crush-resistant, moldable. Used in molded cases and hard shells. Less forgiving, very protective.
How buyers choose
- Student: EPE, low cost.
- Mid: EVA, balance of feel and protection.
- Pro/travel: EPS or EVA high-density.
Ask your factory for foam specs by density — we publish ours. Ask about padding options.