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FAT Sleep Firm 25cm Bonnell Spring Mattress | 4cm Support Foam | Orthopaedic | 4 Sizes

FAT Sleep Firm 25cm Bonnell Spring Mattress | 4cm Support Foam | Orthopaedic | 4 Sizes

Regular price £139.00 GBP
Regular price £194.00 GBP Sale price £139.00 GBP
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Precision-engineered with a robust 18cm Bonnell spring core and 7cm of combined comfort foam layers for a stable, restorative sleep.

If you need a bed that offers consistent stability  without that "sinking" feeling, this is your solution. We have upgraded the comfort layers to include a substantial 4cm support foam block on top of the springs, finished with a luxuriously quilted top.

Product features

  • PREMIUM QUILTED SURFACE: The top layer features high-quality knitted fabric quilted with 3cm of foam, providing immediate softness and breathability the moment you lie down.
  • ENHANCED PRESSURE RELIEF: Unlike standard mattresses, this model is filled with a dedicated 4cm layer of Support Foam, bridging the gap between the springs and your body for balanced cushioning.
  • TRUE FIRM CORE: At its heart lies a heavy-duty 18cm Bonnell Spring system (crafted from thick 2.3mm wire) that ensures your spine stays aligned all night.
  • DOUBLE PROTECTION: We use cotton felt pads
    both above and below the spring unit. This protects the foam layers
    from the springs and significantly extends the lifespan of your
    mattress.
  • BREATHABLE DESIGN:
    The layered construction, including non-woven fabrics and breathable knitted tops, promotes airflow for a fresher sleep environment.

Technical Specs & Details:

  • Total Depth: 25 cm (approx. 10 inches)
  • Mattress Type: Open Coil / Bonnell Spring
  • Firmness Rating: Firm (Orthopaedic Feel)
  • Delivery: Vacuum packed, rolled, and boxed for easy transport.

Perfect For:

  • Back sleepers requiring spinal alignment.
  • Sleepers who prefer a stable surface over "sinking" memory foam.
  • Landlords and guest rooms requiring durable, long-lasting furniture.

Materials and care

Inside Your Mattress (8-Layer Construction):
We believe in transparency. Here is exactly what makes up your 25cm mattress, from top to bottom:

  1. Luxury Top Cover: Soft-touch Knitted Fabric.
  2. Instant Comfort: Quilted with 3cm Foam for a plush surface feel.
  3. Protective Layer: Durable Non-Woven Fabric to hold layers in place.
  4. Deep Support: Filled with 4cm Support Foam for orthopaedic resistance.
  5. Spring Insulation: Cotton Pad (protects foam from springs).
  6. The Core: 18cm Bonnell Spring Unit (Robust 2.3mm wire gauge).
  7. Base Insulation: Cotton Pad (protects base from springs).
  8. Base Finish: Durable Polyester Fabric on the underside.


Arrives rolled in a compact box. Simply unbox, unroll, and allow 24–72 hours for the mattress to fully expand to its original 25cm depth.

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Variant Variant total Quantity Price Variant total
Single (3ft)
Single (3ft)
Regular price
£194.00
Sale price
£139.00/ea
£0.00
Regular price
£194.00
Sale price
£139.00/ea
£0.00
Small Double (4ft)
Small Double (4ft)
Regular price
£250.00
Sale price
£179.00/ea
£0.00
Regular price
£250.00
Sale price
£179.00/ea
£0.00
Double (4ft6)
Double (4ft6)
Regular price
£250.00
Sale price
£179.00/ea
£0.00
Regular price
£250.00
Sale price
£179.00/ea
£0.00
King (5ft)
King (5ft)
Regular price
£299.00
Sale price
£219.00/ea
£0.00
Regular price
£299.00
Sale price
£219.00/ea
£0.00

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