Rollover to zoom

Silentnight Geltex 1850 Mattress - King Size

£649.99 (inc VAT)
£541.66 (exc VAT)

Standard Delivery Included *

Item # 185015
Sign in to use My Wishlist
Our carrier will contact you via phone, text or email within 2 business days from confirmation of your order to arrange delivery within 10 business days. Find out more about our Delivery Terms.
Print this Page

Product Details


The right mattress is vital in getting a good night’s sleep and waking up feeling rested and refreshed. Silentnight have created the answer to this with Geltex - groundbreaking new technology which delivers unparalleled breathability, perfect pressure relief and optimal body support. Collectively delivering the ultimate sleep solution.

Unparalleled Breathability
Many people fail to enjoy a full and deep night's sleep because of uncomfortable overheating. Geltex has a unique open cell structure which provides unparalleled breathability, allowing air to pass through easily, preventing the body from overheating.

Perfect Pressure Relief
A unique fusion of gel molecules, foam crystals and air cells makes Geltex extremely flexible and adaptable. These advanced flexible properties distribute body weight evenly, preventing pressure points from building by relieving pressure where you need it most, helping to reduce the discomfort of aching joints and reduce circulatory problems.

Optimal Body Support
Innovative elasticity ensures immediate spring back for ultimate support and comfort. As no two individuals are the same, Geltex responds to the individual contours of the body, providing perfect spinal alignment and support throughout the night.


  • Springs: 1850 zoned Mirapocket spring system
  • Firmness rating: Medium/Soft
  • Geltex: 8cm Geltex comfort layer (in mattress pillowtop)
  • Turning instructions: No need to turn, simply rotate, at least once every 3 months
  • Warranty: 5 years 

Our delivery team can take away your old bed or mattress when your new one is delivered, and it will be recycled in an environmentally friendly way. Please be aware that once they have taken away your old bed or mattress, it is non-returnable. If you have a wooden or metal slatted bed frame it will only taken away if dismantled. If you would like to take advantage of this service, please inform us when you are called to arrange delivery.


  • Brand: Silentnight
  • Type: Mattress
  • Dimensions: H 31 x W 150 x L 200 cm
  • Mattress Features: No Turn
  • Mattress Comfort: Pocket Spring/Gel
  • Mattress Size: King Size
  • Mattress Firmness: Medium


      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 within business days from confirmation of your order to arrange delivery. Delivery can be made business days from the date of order confirmation.

      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 guarantee your satisfaction and want you to be happy with your purchase. If you wish to return an item or you would like to contact us, please click here for more information.

      Please pack your parcel up securely, preferably using its original packaging, but removing the delivery label.

      If your order was delivered "Kerb side", it will need to be available for kerb side pick up.
      If the item arrived to you in a box, it will need to be in a box at the time of pick up.

      We regret that we cannot accept and process online purchase returns at any Costco Warehouses.

      Find out more about our Delivery, Cancellations and Assistance Policy

      Silentnight Geltex 1850 Mattress - King Size is rated 4.8 out of 5 by 59.
      Rated 5 out of 5 by from fabulous mattress Ordered this mattress online after reading many reviews. Felt I was taking a risk as I hadn't actually tried it out but the risk definitely paid off. Very happy with my purchase :) Lying on this mattress is like being suspended on very firm marshmallows. It is sooo comfortable! Only downside - you don't want to get out of bed in the morning. Some reviews reported a chemical odour. I aired it on day of delivery and it was perfect that night, with no odour. Be aware of depth of mattress - 31cm. I needed to order new fitted sheets but plenty online outlets do 12"-16" deep fitted sheets which work perfectly.
      Date published: 2016-10-05
      Rated 5 out of 5 by from The joy of a new mattress It was well past the recommended 7 years to change our mattress and the reviews of a Geltex were very appealing. The delivery was quick and the service at the house was faultless - the guys from Panther Group did a first rate job. The mattress was firmer than our old one but not excessively that concerned us. The result from next morning was a resounding tick in the box for Silentnight as had a great night's sleep. Yep, we should have changed mattresses sooner but the Geltex is a joy to have. Oh, and a good price from Costco as we shopped around on the internet for a new mattress.
      Date published: 2016-07-04
      Rated 4 out of 5 by from Good mattress This is a good mattress,the extra layer of geltex feels really goo, not too soft and not too hard, just right and supports the body well. Delivery was quick and the delivery guys will put the mattress in the room you require it. It looked and feels very heavy. The only bad point is that it had a funny smell, like really strong glue or chemicals. I had to air it for over a week to get rid of the smell. I have a good night's sleep and I am happy with my purchase.
      Date published: 2016-05-12
      Rated 5 out of 5 by from Unparalleled Comfort I left writing this review for a couple of weeks so that I could give an honest opinion. This mattress is the most comfortable mattress I have ever slept on. I've had problems sleeping soundly lately and always woke up with aching shoulders and feeling tired so I thought it was about time I changed my mattress. I now sleep soundly and in the most glorious comfort. I would highly recommend this product to anyone thinking of changing their mattress.
      Date published: 2016-07-08
      Rated 5 out of 5 by from 5 STAR Second mattress delivered in same number of weeks. This one however is for keeps. Every single sleep (since having this gel tech mattress) I have woken up in the position I went to sleep. I can't remember ever doing this before. Ever! You sink into the mattress and it's so comfortable that's where you wake up. As a RA sufferer, good sleep is a necessity. I can only compare this bed to the wave hotel in Dubai. It's great. And well worth the price.
      Date published: 2016-05-06
      Rated 5 out of 5 by from Love this mattress We bought this a month ago, as I have been having back pain, plus our old mattress was getting old. Great delivery, the drivers unpacked it, put it on the bed and took the old one away. There was no smell as others have mentioned. It is a lot higher than our old one. It is really comfortable, love it. I had to buy deep fitting sheets, easily available in supermarkets. It is very heavy though, and needs turning.
      Date published: 2016-10-04
      Rated 5 out of 5 by from Quality item We have had this mattress nearly two weeks now. First impressions were that it was softer than we had anticipated but we have since found that this is the thick Geltec topper which is underpinned by the firmer pocket spring mattress. Both myself and my wife were complaining of back ache when we got up in the mornings but this has since disappeared since changing to this mattress
      Date published: 2016-04-05
      Rated 5 out of 5 by from Amazing Mattress sorted my bad back I have had back problems for a number of years and I used to wake up every morning with a sore back. A saleman for a leading bed retailer recommended this mattress but at £650 it was outside my price bracket. When I saw this mattress at CostCo for a third off the normal price I jumped at it. This mattress is so comfy it is brilliant you will not regret it for a second.
      Date published: 2016-05-08
      • y_2017, m_10, d_17, h_20
      • bvseo_bulk, prod_bvrr, vn_bulk_2.0.3
      • cp_1, bvpage1
      • co_hasreviews, tv_1, tr_58
      • loc_en_GB, sid_185015, prod, sort_[SortEntry(order=RELEVANCE, direction=DESCENDING)]
      • clientName_costco-uk
      Thank you for signing up!
      Thank you for your interest in our emails! To ensure you receive them in your inbox, please add to your address book.
      Thank you for signing up!
      Thank you for your interest in our emails! To ensure you receive them in your inbox, please add to your address book.