- Matigas na kahoy na pinatuyong tapahan para sa katatagan
- Corner-block at dowelled joints
- Metal reinforcements para sa karagdagang lakas
- High-density na foam (2.0–2.5 lb)
- Spring coil o webbing support system
- Multi-layer cushion construction para sa ginhawa
- Precision pattern cutting at pananahi
- Strainer at clamp attachment
- Pagsusuri ng kalidad ng tahi at pag-igting
