memory foam

What Is Memory Foam?

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Memory foam, initially developed for NASA seating, is a low-resilience polyurethane enhanced with chemical additives to create a slow-recovery, viscoelastic material. Its open-cell structure encourages airflow for breathability, while the foam’s temperature sensitivity allows it to soften where the foot is warm and gradually return to shape when unloaded.

memory foam

Density & Hardness: The Key Specs

Density (kg/m³ / lb/ft³)

50–90 kg/m³ (≈ 3.1–5.6 lb/ft³) is standard for insole sheets, balancing durability and cushioning

Lower densities (< 50 kg/m³) risk bottoming out, while higher densities (> 90 kg/m³) can feel overly firm and heavy.

Hardness (ILD / Asker F)

70–90 ILD under Asker F durometers delivers a medium-soft feel with reliable support.

Below 70 ILD, foam may feel too plush; above 90 ILD, it becomes too stiff for everyday comfort.

Why the Right Foam Matters

Pressure Relief & Comfort
Memory foam disperses foot pressure evenly, reducing hotspots and fatigue during prolonged wear.

Shock Absorption
Its viscoelastic network dampens up to 90 % of impact energy, crucial for joint protection in athletic and safety footwear.

Customized Fit
The material’s temperature-activated molding creates a bespoke footbed for each wearer, enhancing stability and comfort.

B2B Ordering & Logistics

Shipping: FOB Xiamen (Incoterms 2020) – we handle domestic China logistics; you arrange international freight from Xiamen Port.

Payment:

Large Orders: 30 % deposit via T/T; 70 % balance against Bill of Lading.

Small Orders: 100 % T/T or cash on confirmation Foam Factory, Inc..

MOQ: 22.4 m³ (one roll: 40 m × 1.4 m × 0.4 m); custom slicing available.

Lead Time:

Standard: 5–7 business days (regular materials/sizes)

Custom: 7–10 business days (special raw materials)
(Lead times commence after sample approval and deposit receipt.)

  • Shipping: FOB Xiamen (Incoterms 2020) – we handle domestic China logistics; you arrange international freight from Xiamen Port.
  • Payment:
    • Large Orders: 30 % deposit via T/T; 70 % balance against Bill of Lading.
    • Small Orders: 100 % T/T or cash on confirmation.
    • MOQ: 22.4 m³ (one roll: 40 m × 1.4 m × 0.4 m); custom slicing available.
    • Lead Time:
      • Standard: 5–7 business days (regular materials/sizes)
      • Custom: 7–10 business days (special raw materials)
      • (Lead times commence after sample approval and deposit receipt.)

Care & Maintenance

Cleaning: Machine-wash on gentle cycle; air-dry away from direct heat to preserve foam resilience.

Rotation: Alternate two pairs of insoles every few days for full recovery.

Inspection: Replace when compression set exceeds 10 % or surface cracking appears.

Choosing the right memory foam density and hardness is vital for insole performance—impact absorption, pressure relief, and wearer comfort all depend on precise specs. With Yongjiu’s 50–90 kg/m³, 70–90 ILD memory foam sheets, transparent FOB Xiamen shipping, flexible T/T payment terms, and 5–10 day lead times, B2B customers can confidently source tailored, high-quality cushioning solutions for any footwear application.

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