Eclipse Serene 3000 Pocket Boxtop Mattress in 4 SizesEclipse Serene 3000 Pocket Boxtop Mattress in 4 Sizes
Eclipse Smoothtech 3000 Mattress, 4 SizesEclipse Smoothtech 3000 Mattress, 4 Sizes
Eclipse Serene 3000 Pocket Boxtop Mattress in 4 SizesEclipse Serene 3000 Pocket Boxtop Mattress in 4 Sizes
Eclipse Smoothtech 3000 Mattress, 4 SizesEclipse Smoothtech 3000 Mattress, 4 Sizes
Eclipse Serene 3000 Pocket Boxtop Mattress in 4 SizesEclipse Serene 3000 Pocket Boxtop Mattress in 4 Sizes

Eclipse Serene 3000 Pocket Boxtop Mattress in 4 Sizes

Item #Eclipse3000Matt

Starting at£419.98
Shipping Included
  • - Available in Single, Double, King & Super King
  • - Comfort Rating: Medium
  • - Mattress Depth: 37 cm
  • - 1000 Pocket Springs & 2000 Comfomatic Micro Springs
  • - Exclusive SmoothTech™ Technology For a Silky Smooth Surface 

We will contact you within 16 business days for delivery within 20 business days from the date of your order (excluding weekends and bank holidays). Postcode restrictions may apply. Find out more in the Delivery & Returns Tab below

Your credit/debit card will be charged when your order is placed on this item.

Millbrook MattressesMillbrook Mattresses 

Relax, wake up and benefit from the most comfortable sleep you have ever enjoyed with the Eclipse Serene 3000 Pocket Boxtop Mattress. Each mattress is individually handmade in England by specially trained, certified craftsmen and features natural fillings including specially selected British Hampshire wool and English cotton.

Sumptuous Hampshire wool, delivers total body comfort with unrivalled breathability, humidity control and moisture wicking, assisting your body’s natural temperature regulation process to keep you cool in the summer and warm in the winter. Cotton is highly breathable and wicks away any moisture. This combination brings amazing comfort and is ideal for a good night’s sleep.

The Smooth-Tech™ tuft free sleeping surface features a luxurious 100% chemical-free Viscose cover. The Smooth-Tech™ technology creates a mattress with the same performance as a traditionally tufted mattress but with a smoother sleep surface for an even more perfect sleep.

Designed from the start with end-of-life in mind, the Serene 3000 pocket boxtop mattress features a NemoFlex™ core – a revolutionary encapsulated spring system made from recycled plastic bottles. This strengthens the core of the mattress, offering ultimate support. With no staples or stitching, the NemoFlex™ core is also easy to remove, making recovery and re-purposing of valuable materials more efficient, helping reduce the number of waste mattresses going to landfill each year.


  • Sleep Surface: Unique Smooth-Tech™ tuft free sleeping surface
  • Comfort Filling: Layered with fully recyclable polyester & Hampshire wool 
  • Support System: 1000 Full size pocket springs & 2,000 body contouring smaller comfort pocket springs
  • NemoFlex™ technology creates an encapsulated spring system with 100% recycling capability
  • Firmness Rating: Medium
  • Mattress Depth: 37 cm
  • One Sided: No turn, rotate only using the built-in handles
  • Handmade in the UK

Care Instructions: It is important you rotate your mattress regularly to aid even filling settlement and to prolong the mattress life. You should rotate your mattress weekly for the first four months. Thereafter, it should be rotated every month. 

CollectionSerene 3000
Mattress SizeSingle
King Size
Super King Size
Mattress FirmnessMedium
Special FeaturesNatural Fillings
Pocket Sprung
Mattress TypePocket Spring
  •   Delivery is via a 2 person carrier and includes delivery to a room of your choice, packaging removal and full assembly. Our carrier will contact you via phone, text or email.
  •   We offer an additional service to remove your old mattress when your new one is delivered, ensuring that it will be responsibly recycled. The mattress must be in a hygienic condition, and if left outside, must be dry. Please be aware that once we have taken away your old mattress, it is non-returnable. If you require this disposal service, it can be added to your order on our checkout page.
  •   Additional day(s) transit may be required for remote areas.
  •   Public and Regional holidays may affect delivery lead times.
  •   Delivery times may vary in the event of adverse weather conditions.
  •   Please note that we are only able to deliver to the UK mainland, excluding Post Office boxes and BFPO.
  •   Further postcode delivery restrictions might apply to this item.
  •  We are committed to offering the best value to our members, with a satisfaction guarantee on both your membership and merchandise. If you have questions about your membership or products you've purchased at Costco, please contact our Customer Care team.
  •  If you wish to return an item, please view Costco's Return Policy.
  •   Costco Concierge Services | Technical Support
    Free technical support exclusive to Costco members for select electronics and consumer goods.
  •  Items purchased online can be returned at any of our UK warehouses if you are a warehouse member.
  •  Many of our small items can be returned via “My account” on the website and printing a return label. This label must be attached to the box being returned.
  •  Please securely pack the items you intend to return in a box. If you are using the original packaging, be sure to remove the delivery label.
  •  If you need to return a larger item, please contact our Member Care team via the chat function on our website or call 0800 0324 324.
  •  Find out more about our Delivery, Cancellations and Assistance Policy
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