Felt serves as a core functional interlayer in mattresses. It is mainly placed between springs and comfort layers, under the top fabric, or at the bottom of the mattress, with the following functions:

1. Moisture-proof, moisture-absorbent, mildew & damp resistant

Absorbs sweat, humidity and moisture, releasing it slowly to keep the interior dry.

Blocks moisture from the bed frame/ground from penetrating upward, inhibiting mold, odors and bacterial growth.

2. Shock absorption, noise reduction & spring protection

Isolates springs from foam/latex, reducing friction and squeaks for quieter movement.

Absorbs pressure, distributes stress, prevents springs from piercing the fabric, and extends service life.

3. Thermal insulation & temperature consistency for year-round comfort

Retains heat in winter, ventilates without stuffiness in summer, providing stable temperature.

Wool felt is softer against skin, better at heat retention and cold isolation, ideal for damp and cold regions.

4. Shape stabilization & reinforcement, anti-sagging

Improves overall firmness and structure, preventing shifting, clumping and sagging of comfort layers.

Keeps the mattress flat and resistant to deformation.

5. Flame retardant, eco-friendly & auxiliary support

High-quality felt (especially wool) is naturally flame-retardant and self-extinguishes when removed from fire.

Fibrous structure is breathable to avoid sweating; firm felt provides mild spinal support.

In short: Felt = mattress moisture barrier + protective layer + soundproof layer + stabilizing layer. It is essential for spring mattresses, especially in humid southern regions.