The OTTY Pure+ Hybrid 4000 is the softest OTTY, a 28cm, 5.5/10 hybrid with two layers of springs and bamboo memory foam.
The OTTY Pure+ Hybrid 4000 is a 28cm hybrid with up to 4,000 encapsulated pocket springs split across two layers, and at 5.5 out of 10 it is the softest mattress OTTY makes. It costs from £599.99 for a single and £829.99 for a double (September 2026), the most expensive of OTTY’s bed-in-a-box hybrids.
The OTTY product page lists more layers than any other OTTY hybrid. Instead of the single 16cm spring unit used in the Original and Pure, the Pure+ stacks an 8cm layer of 2,000 springs over a layer of 2,000 shorter 4cm springs, with foam between them and reinforced borders around both.
| Layer | Material | What it does |
|---|---|---|
| 1 | Cover with 2cm viscoelastic memory foam | Soft surface, removable and washable |
| 2 | Bamboo and charcoal memory foam | Pressure relief, temperature regulation |
| 3 | 2,000 encapsulated pocket springs, 8cm | Upper support and contouring |
| 4 | High-density reflex foam | Transition between spring layers |
| 5 | Drilled cooling memory foam | Air circulation |
| 6 | 2,000 encapsulated pocket springs, 4cm, with reinforced borders | Lower support and edge |
| 7 | Airflow side supports around both spring layers | Edge support and ventilation |
| 8 | High-density base foam | Stable foundation |
The soft first contact comes from the top: 2cm of memory foam inside the cover and a bamboo and charcoal memory foam layer below it. The upper 8cm springs then follow the shoulder and hip, and the lower layer and its reinforced borders stop heavier areas sinking too far. The drilled memory foam between the two spring layers is there for air circulation. Price climbs steeply with size, so compare the double and king figures below with the Pure’s before deciding.
Side sleepers and lighter people who want the shoulder and hip to sink in are the natural buyers of the Pure+, along with anyone who finds the 7/10 Original too hard. It is not the one for front sleepers, whose hips need a firmer surface, or for people over about 15 stone, who are better served by the Extra Firm. OTTY asks for a head-to-toe turn once a month for the first 12 months, then every three months.
| UK size | Dimensions (cm) | Price (September 2026) |
|---|---|---|
| Single | 90 x 190 | £599.99 |
| Double | 135 x 190 | £829.99 |
| King | 150 x 200 | £929.99 |
| Super king | 180 x 200 | £1,039.99 |
The Pure+ comes in the four standard UK sizes only, and it is the priciest of OTTY’s memory foam hybrids in every one of them. The usual OTTY terms apply: 100 nights to decide (with a 30-night minimum before a return), a 10-year guarantee and free two-person delivery to mainland UK addresses.
| Brand | OTTY |
|---|---|
| Material | Cover infused with 2cm of viscoelastic memory foam, bamboo and charcoal memory foam, a layer of 2,000 encapsulated pocket springs, high-density reflex foam, drilled cooling memory foam, a second layer of 2,000 encapsulated springs with reinforced borders, Airflow side supports and a high-density foam base. |
| Firmness | Medium (5/10) |
| Height | 28 cm |
| Sleep trial | 100 nights |
| Warranty | 10 years |
| Delivery | Free two-person delivery |
| Available sizes | 90x190, 135x190, 150x200, 180x200 |
| Overall score | 8.4/10 |
| Certifications | CertiPUR |
“Side sleepers who want a softer, deeper hybrid should start with the Pure+, which pairs two spring layers with a 5.5/10 feel, from £599.99 in a single. Front sleepers and heavier people should choose the Original or the Extra Firm instead.”
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