King Size Mattresses

Collection: Buy King Size Mattresses on Sale

Buying a king size mattress is a bigger investment than a double, so it pays to understand what you're actually getting for the money. Pocket sprung king mattresses use individually wrapped springs that respond independently to pressure, which means one person turning over doesn't send movement across to the other side of the bed. Hybrid king mattresses add a foam comfort layer on top of the springs, giving you the pressure-relieving benefits of memory foam alongside the support and breathability of a sprung base. Full memory foam king mattresses excel at motion isolation and contouring but tend to retain more heat, so they suit cooler sleepers or those with pressure-related pain more than hot sleepers. Depth is worth checking too, as a king size mattress under 20cm tends to compress more quickly over time. A mattress protector is worth fitting straight away to safeguard your investment from day one.

How do I know if a king size mattress will fit my bed frame?

A standard UK king size mattress measures 150cm x 200cm, so you need a bed frame built to those dimensions rather than a double (135cm x 190cm) or a super king (180cm x 200cm). Some shoppers also ask whether a king size mattress from one brand will fit a bed frame from another, and the answer is generally yes provided both use standard UK king dimensions. Though it is worth double-checking the internal frame measurement before ordering. If you want to adjust the feel of your new king mattress without replacing it later, a mattress topper lets you fine-tune firmness on top. For a complete sleep setup, our memory foam mattresses, pillows, and king size bedding all pair well with a new king size mattress.