The Best King Size Mattresses for Side Sleepers in 2025: Top Picks for Pressure Relief & Comfort
If you’re a side sleeper, you know the drill: shoulder aches, hip pain, and that awkward moment when you realise your mattress is about as supportive as a wet sponge. Fear not. We’ve rolled, flopped, and dramatically tested a lineup of king-size mattresses that promise pressure relief, cushy comfort, and no judgment for those who sleep like a curled-up prawn. Whether you're looking for a hybrid hero or a memory foam marvel, here are the best options in the UK for 2025.
SUAYEA King Size Mattress
⭐⭐⭐⭐(4.5/5)
| Feature | Detail |
|---|---|
| Type | Hybrid (Memory Foam + Pocket Springs) |
| Firmness | Medium Firm |
| Thickness | 12 Inches |
| Motion Isolation | Excellent |
| Pressure Relief | High |
Why we love it:
The SUAYEA is like the mattress equivalent of a supportive friend—reliable, balanced, and won’t let you sink too far. With multiple layers of high-density foam and individually wrapped springs, it’s crafted for side sleepers who need a bit of give but still crave spinal support. It also stays cool throughout the night, so no more waking up like a sweaty burrito.
Resspry King Size Mattress
⭐⭐⭐⭐⭐(4.8/5)
| Feature | Detail |
|---|---|
| Type | Hybrid (Memory Foam + Pocket Springs) |
| Firmness | Medium-Soft |
| Thickness | 12 Inches |
| Motion Isolation | Excellent |
| Pressure Relief | High |
Why we love it:
If memory foam and spring had a baby, this would be it. The Resspry mattress has all the contouring comfort of foam, with the bounce-back resilience of a pocket spring core. Ideal for side sleepers who like a little sink without sacrificing structure. Plus, the breathable top layer helps you keep your cool—even if you’re dreaming about that awkward 2009 karaoke performance your mates filmed and never let you forget.
Silentnight Miracoil Cushion Top Mattress
⭐⭐⭐⭐(4.3/5)
| Feature | Detail |
|---|---|
| Type | Miracoil Spring System |
| Firmness | Medium-Firm |
| Thickness | Approx. 10-11 Inches |
| Motion Isolation | Moderate |
| Pressure Relief | High |
Why we love it:
Silentnight has been around longer than your dodgy back pain, and the Miracoil Cushion Top proves why. The unique Miracoil design gives full-body support and minimises partner disturbance. The cushion top adds a layer of plushness that side sleepers will adore. British-made, affordable, and built to last—like a good cup of tea.
UNNMIIY King Mattress
⭐⭐⭐⭐⭐(4.7/5)
| Feature | Detail |
|---|---|
| Type | Gel Memory Foam |
| Firmness | Medium Firm |
| Thickness | 10 Inches |
| Motion Isolation | Excellent |
| Pressure Relief | High |
Why we love it:
This mattress is like sleeping on a cool cloud of logic. The UNNMIIY features gel-infused foam that keeps temperatures in check, while also hugging your hips and shoulders like it was made just for them. Side sleepers will appreciate the balance between plushness and posture support. Bonus: no more wrestling with the duvet like you're reenacting a wildlife documentary.
Aotumm Ciort King Size Mattress
⭐⭐⭐⭐⭐(4.5/5)
| Feature | Detail |
|---|---|
| Type | Innerspring Hybrid |
| Firmness | Medium |
| Thickness | 27cm |
| Motion Isolation | Moderate |
| Pressure Relief | Good |
Why we love it:
The Aotumm Ciort sounds like a luxury sports car, and honestly, it kind of sleeps like one too. With responsive springs and a cushy top layer, this hybrid mattress makes side sleeping feel surprisingly athletic. Zoned support means your shoulders and hips get the extra love they deserve.
Good Nite King Mattress Memory Foam 
⭐⭐⭐⭐(4.4/5)
| Feature | Detail |
|---|---|
| Type | Memory Foam |
| Firmness | Medium |
| Thickness | Approx. 10 Inches |
| Motion Isolation | Good |
| Pressure Relief | High |
Why we love it: The Good Nite mattress is aptly named. It’s a dependable, no-nonsense memory foam mattress with a soft, skin-friendly cover and layers that contour beautifully to a side sleeper’s frame. It’s not flashy, but it’s solid, consistent, and guaranteed to make mornings a bit less miserable.
TeQsli Gel Individually Pocket Sprung
⭐⭐⭐⭐⭐(4.7/5)
| Feature | Detail |
|---|---|
| Type | Gel Memory Foam + Pocket Spring |
| Firmness | Medium-Firm |
| Thickness | 10 Inches |
| Motion Isolation | Excellent |
| Pressure Relief | High |
Why we love it:
This mattress is basically your spine’s personal assistant. The individually pocketed springs provide tailored support, while the gel foam keeps things from heating up. Side sleepers will love the responsiveness, and couples can move around freely without triggering a full-scale midnight duvet war.
Inofia Sleep King Mattress
⭐⭐⭐⭐⭐(4.5/5)
| Feature | Detail |
|---|---|
| Type | Memory Foam Hybrid |
| Firmness | Medium-Firm |
| Thickness | 11 Inches |
| Motion Isolation | Excellent |
| Pressure Relief | High |
Why we love it:
Inofia nails the comfort-to-support ratio with this hybrid memory foam model. Zoned support helps align your body whether you're curled in a foetal fortress or sprawled like a lounge lizard. It’s got motion transfer so minimal, you could host a salsa class on one side and not disturb the other.
Final Verdict: Our Top 2 Picks
1. SUAYEA King Size Hybrid Mattress
-
A brilliant blend of support, bounce, and breathable coolness. Perfect for UK side sleepers needing a durable, comfy mattress that won’t flatten out faster than a Yorkshire pudding.
2. TeQsli Gel Individually Pocket Sprung Mattress
-
Offers responsive comfort with a cooling twist. Great for couples, side sleepers, and anyone tired of waking up in a puddle of their own heat.
Sweet dreams, side snoozers. You’ve earned them.