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Sign in or create an account:

  • for faster checkout
  • to unlock personalised Sparks offers
  • to access order history and track deliveries

King-Size Mattresses

Drift off into a restful sleep on one of our king-size mattresses. Memory foam feels pleasantly firm and moulds to your body, for reliable comfort and a personalised feel. High spring counts provide hotel-level luxury, while orthopaedic styles feature extra-supportive layers. Discover our cool gel options and moisture-wicking technology, and take advantage of free nominated-day delivery

(1 applied)
  • King Size
  • Size with 6 options
  • Firmness Rating with 2 options
  • King Size

There are 25 Items found

Offer
1000 Pocket Spring Firm Mattress1000 Pocket Spring Firm Mattress
£349 - £699
Natural Wool

1000 Pocket Spring Firm Mattress

Exclusive to M&S

Offer
The Guest MattressThe Guest Mattress
£129 - £209

The Guest Mattress

Offer
1050 Pocket Spring Medium Natural Mattress1050 Pocket Spring Medium Natural Mattress
£399 - £749
Natural

1050 Pocket Spring Medium Natural Mattress

Offer
4000 Pillowtop Heritage Mattress4000 Pillowtop Heritage Mattress
£1299 - £1499
M&S x Harrison Spinks

4000 Pillowtop Heritage Mattress

Exclusive to M&S

Offer
7000 Heritage Mattress7000 Heritage Mattress
£1399 - £1599
M&S x Harrison Spinks

7000 Heritage Mattress

Exclusive to M&S

Offer
1500 Pocket Spring Medium Mattress1500 Pocket Spring Medium Mattress
£449 - £799
Natural Wool

1500 Pocket Spring Medium Mattress

Exclusive to M&S

Offer
1250 Pocket Spring Firm Mattress1250 Pocket Spring Firm Mattress
£449 - £799
Ortho

1250 Pocket Spring Firm Mattress

Offer
1050 Pocket Spring Medium Pillowtop Mattress1050 Pocket Spring Medium Pillowtop Mattress
£649 - £749
Pillowtop

1050 Pocket Spring Medium Pillowtop Mattress

Offer
1500 Pocket Spring Firm Mattress1500 Pocket Spring Firm Mattress
£449 - £799
Natural Wool

1500 Pocket Spring Firm Mattress

Exclusive to M&S

Offer
1700 Pocket Spring Medium Lambswool Mattress1700 Pocket Spring Medium Lambswool Mattress
£649 - £999
Pillowtop

1700 Pocket Spring Medium Lambswool Mattress

Offer
1000 Pocket Spring Medium Mattress1000 Pocket Spring Medium Mattress
£349 - £699
Natural Wool

1000 Pocket Spring Medium Mattress

Exclusive to M&S

Offer
1500 Memory Foam Hybrid Mattress1500 Memory Foam Hybrid Mattress
£549 - £899
Memory Foam

1500 Memory Foam Hybrid Mattress

Offer
2000 Pocket Spring Firm Mattress2000 Pocket Spring Firm Mattress
£549 - £899
Natural Wool

2000 Pocket Spring Firm Mattress

Exclusive to M&S

Offer
1050 Spring Cool Gel Medium Mattress1050 Spring Cool Gel Medium Mattress
£449 - £749
Comfortably Cool Gel

1050 Spring Cool Gel Medium Mattress

Offer
1500 Spring Cool Gel Medium Pillowtop Mattress1500 Spring Cool Gel Medium Pillowtop Mattress
£599 - £899
Comfortably Cool Gel

1500 Spring Cool Gel Medium Pillowtop Mattress

Offer
Cashmere & Merino 2250 Pocket Spring Medium MattressCashmere & Merino 2250 Pocket Spring Medium Mattress
£799 - £1149
Pillowtop

Cashmere & Merino 2250 Pocket Spring Medium Mattress

Offer
2000 Pocket Spring Medium Mattress2000 Pocket Spring Medium Mattress
£549 - £899
Natural Wool

2000 Pocket Spring Medium Mattress

Exclusive to M&S

Offer
4600 Pocket Spring Medium Mattress4600 Pocket Spring Medium Mattress
£849 - £1249
Luxury

4600 Pocket Spring Medium Mattress