Natural Fillings — Wool, Cotton and Horsehair
By Kaiser Khan, Editor Updated First published
Desk research from official sources. Not a product test or medical advice. How we check facts.
In short
Traditional UK mattresses often use natural fillings above the springs. Wool adds bouncy loft and helps with moisture. Cotton makes soft quilt layers. Horsehair gives a springy, open fill in higher-spec beds. Fillings shape how the surface feels and how air moves. The spring or foam core still does the main support job. Natural does not automatically mean hypoallergenic.
About 1 minutes to read
How it works
What is inside a natural-filled mattress?
Typical builds use wool, cotton, horsehair, coir or other vegetable fibres (related traditional fills). Exact stacks vary by model. Read the spec, not the shop slogan.
- wool
- cotton
- horsehair
- coir or other vegetable fibres (related traditional fills)
How long does a natural-filled mattress last?
A typical range is 8– 12 years. Body weight, base support and rotation change that. It is not a warranty promise.
8– 12 years
What each filling does
| Filling | Traits |
|---|---|
| Wool | Bouncy loft, resilience, moisture buffering |
| Cotton | Soft quilt layers; can compact over years |
| Horsehair | Springy open fill in traditional stacks |
| Coir / vegetable fibres | Firmer, more rustic support pads in some builds |
Where fillings sit in the stack
Natural fillings are usually comfort and insulation layers above pocket or open coil units. Tufting helps stop fillings moving around. Modern hybrids may combine thin natural quilts with foam comfort layers.
Related BedGuide entries
Frequently asked questions
What does wool do in a mattress?
Wool provides bouncy, resilient cushioning. It can handle moisture better than many synthetics. It sits as a comfort filling above the support unit, not instead of springs or foam cores.
Is horsehair still used in mattresses?
Yes in some traditional and higher-specification UK upholstery. Horsehair is springy and open when properly prepared. It is a filling choice, not a medical claim.