John Lewis & Partners Ultimate Natural Collection 37000
The John Lewis & Partners Ultimate Natural Collection 37000 is aimed at those who prefer a medium feel. It’s upholstered with natural fibres such as insulating wool, breathable cotton, and hemp. The mattress is also springy and anti-bacterial.
There are 36,000 micro springs and a core of 1000 Cortec pocket springs at its centre. These are individually sealed with heat rather than glue.
It has five layers of upholstery on either side of the mattress, most of which seem to be blended pads. We would expect them to be hand teased fibres at this price point. The wool, hemp and Egyptian cotton fillings surround this core and are topped off with a 50% viscose and 50% wool cover. It comes with a seven-year guarantee and a 60-night comfort trial.
While marketed as a firmer mattress, our research rated the Ultimate Natural Collection 37000 as 7 on a scale from 1 (very soft) to 10 (very firm), so in reality, it has a medium feel.
Our research also indicated that although the Ultimate Natural Collection 37000 supports your spine if you’re lying on your front or back, it’s not as supportive when you lie on your side.
The transfer of motion is reduced, which is good, so you’re unlikely to disturb your partner when you move around in your sleep.
Research showed the Ultimate Natural Collection 37000 is not durable. It lost over 1cm in height as the fibres compacted like many mattresses that use natural filling materials but don’t layer them correctly. This will, unfortunately, lead to significant changes in the level of support it provides, mainly when lying on your back.
Using our industry knowledge of spring weights and the information provided on the John Lewis website, we have worked out the GSM of the Ultimate Natural Collection 37000 mattress to be approximately 4200gsm-4700gsm of comfort fibres with the remainder of the weight coming from the springs. The border has five rows of hand side stitching.