Sofa Comfort & Technical Guide — Foam Density, Springs & Ergonomics

Question 1

What is foam density in sofas — 40D vs 46D explained?

Accepted Answer

Foam density is measured in kg/m³ and indicates how much material is packed into the foam — it directly affects durability and longevity. 32D foam (low density) flattens within 2–3 years. 40D foam (medium density) shows compression within 5–7 years. 46D foam (high density) retains its shape for 12–15+ years under daily family use and is the industry standard for quality sofas. SOISU's Italian sofas use 46D and above foam cores. Always ask for the foam density specification in writing before buying any sofa in India.

Question 2

What is the difference between webbing and spring sofa construction?

Accepted Answer

Webbing (elastic or jute straps) is a lower-cost construction that works acceptably for light use but sags under daily heavy use within 5–7 years. Eight-way hand-tied coil springs individually support each part of the seat, distribute weight evenly, and maintain tension for 15–25 years. Eight-way hand-tied springs are the gold standard in quality sofa construction — the method used in Italian luxury manufacturing and in every SOISU sofa.

Question 3

Which sofa is best for back pain?

Accepted Answer

The best sofa for back pain has seat height between 45–50 cm (feet rest flat with knees at 90°), seat depth of 55–60 cm, firm lumbar support in the lower backrest, and high-density foam. Recliners are excellent for back pain — a reclined position reduces spinal compression by up to 50%. Avoid very deep, soft sofas where you sink in and cannot maintain a natural spinal curve. SOISU's ergonomic sofa and recliner range is designed with these principles.

Question 4

What is the ideal seat depth for a sofa?

Accepted Answer

For upright sitting — working, dining, socialising — a seat depth of 55–60 cm works for most adults. For lounging and TV-watching, a deeper seat of 65–75 cm is more comfortable. The most common mistake is choosing a sofa with the wrong seat depth for your height. SOISU recommends sitting in each sofa for at least 10 minutes during your showroom visit — comfort only becomes apparent after the first 5 minutes.

Question 5

What makes a sofa ergonomic?

Accepted Answer

An ergonomic sofa supports your body's natural posture without conscious adjustment. Key ergonomic features: seat height allowing feet to rest flat (42–48 cm), seat depth supporting full thigh length, lumbar support in the lower third of the backrest, armrest height allowing shoulders to rest naturally, and firm-support foam. Italian furniture manufacturers lead ergonomic sofa design because their products must perform comfortably across a 20+ year lifespan.

Question 6

Which sofa is best for working from home and long sitting hours?

Accepted Answer

For working professionals spending 6–10 hours on a sofa, choose an ergonomic sofa with lumbar support, medium seat depth (58–62 cm), and firm high-density foam. A recliner with multiple lock positions is ideal — you can shift between upright for focused work and reclined for calls or reading. SOISU's recliner collection at Prabhadevi includes models with multiple ergonomic positions suitable for extended daily use by working professionals.

Warranty Policy

SOISU Furnitures LLP | Effective Date: April 2026 | Applies to all products purchased from SOISU

Overview

1. Warranty Coverage

What is Covered

Frame

Foam & Cushioning

Electrical Components (Recliners & Motorised Mechanisms)

2. What is Not Covered

3. Dimensional Tolerance

4. How to Make a Warranty Claim

5. Warranty Service

6. Limitation of Liability

7. Jurisdiction