Silentnight Orthopaedic 3cm Mattress Topper im Test

The Silentnight Orthopaedic 3cm Mattress Topper is a 3cm profiled memory foam topper with a removable, washable cover, sold in all five UK sizes at Julian Charles from £45 for a single. Argos quotes the supplier as describing its support as medium/firm, so it adds pressure relief without making the bed soft.

Specification

The Julian Charles product page gives the fullest composition, and the Argos listing via Habitat carries the same barcode for the single, so it is the same product.

What “orthopaedic” means here

The profiled surface spreads contact into many small points and lets air circulate between them, which is what Silentnight means by pressure relief. “Orthopaedic” is a marketing description, not a medical rating, and the research points to feel rather than labels: in a Lancet trial of 313 adults with chronic low back pain, medium-firm mattresses beat firm ones on pain and disability after 90 days (Kovacs et al., 2003), and a 2021 review of 39 studies reached the same view (Caggiari et al.). A thin, medium-firm topper fits that band without softening the bed much; we score it 6 out of 10.

Sizes and prices

Prices are Julian Charles regular prices, checked in September 2026; delivery is free over £59. The same topper costs noticeably more at Argos and Habitat in the sizes they stock (single and king), and Argos excludes it from its 30-day money-back guarantee, so it pays to compare.

Who it suits

The Orthopaedic 3cm suits back sleepers and people who find their mattress slightly hard at the shoulders but do not want it to feel soft. It is too thin to change a firm mattress dramatically, and side sleepers who need real cushioning will get more from a deeper foam topper such as the Silentnight Impress 5cm. The removable cover is washable, but the foam is not, so a protector over it will help keep it fresh.

One practical note from buyers: an Argos reviewer found the cover a tight fit over the profiled foam and the edges prone to curling. Fitting the cover before putting the topper on the bed, and smoothing it out from the centre, makes that easier.