Silentnight UltraGel 3000 Pocket Boxtop Medium Firm Mattress

Assessed from the specification published by Mattress Man, captured September 2026, and from regular price comparison across our UK retail partners.

A medium firm feel sits in the range most sleepers get on with, and the hybrid build gives you the responsive support of pocket springs combined with gel material, which is generally used to help with comfort and cooling. The boxtop adds an extra cushioned layer stitched on top, so the initial feel is softer than the support core beneath. Silentnight is a long-established UK name, which offers some reassurance at a mid-range starting price. It's a real investment, but you are paying for a hybrid construction rather than a basic foam or open-coil design. Mattressman lists a 60-night trial, so there is a window to change your mind if you buy there.

Side sleepers
The cushioned boxtop layer stitched on top gives a softer initial feel, which suits side sleepers who want some give at the shoulder and hip.

Warm sleepers
Gel material is generally used to help with comfort and cooling, and it sits alongside the pocket springs in this hybrid build.

Combination sleepers
Responsive pocket springs under a medium firm feel make it easier to shift position, with the softer boxtop keeping each position comfortable.

Couples
Pocket springs give responsive support and the range goes up to Super King, so two sleepers have plenty of room on one mattress.

Back sleepers
A medium firm feel sits in the range most sleepers get on with, giving a supportive base beneath the softer boxtop top layer.

If you prefer a genuinely firm, flat sleeping surface, the boxtop's cushioned top may feel softer than you want. It is also worth knowing that boxtop mattresses cannot be flipped, so you can only rotate it. Budget shoppers should note the starting price puts it above entry-level options.

Is the Silentnight UltraGel 3000 Pocket Boxtop firm or soft?

It is rated medium firm, which suits most sleepers. The boxtop construction adds a cushioned layer on top, so the surface feels a little softer initially than the supportive core beneath it.

What sizes does the Silentnight UltraGel 3000 come in?

Five UK sizes are available: Single, Small Double, Double, King and Super King.

Does the Silentnight UltraGel 3000 come with a sleep trial?

Mattressman offers a 60-night trial. This is Mattressman's own offer rather than a Silentnight guarantee, so check the terms if you buy elsewhere.

How quickly can the Silentnight UltraGel 3000 be delivered?

Mattressman lists free next day delivery, with a transit time of 1 to 3 days. As with the trial, this is the retailer's own service, so delivery terms may differ if you buy from another shop.

Can you flip the Silentnight UltraGel 3000 Boxtop mattress?

No. Boxtop mattresses have their comfort layer stitched to one side only, so they are single-sided. You should rotate it regularly instead to help it wear evenly.