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An Ideal Home reviewer tested Simba’s Natural Hybrid Source mattress for two weeks and reported strong temperature regulation and motion isolation. The reviewer and her husband found it firmer than Simba’s stated medium-firm feel, while a back-sleeping tester who prefers firm, natural-material mattresses praised its support.
Ideal Home reviewer Jennifer Oksien tested Simba’s Natural Hybrid Source mattress for two weeks, reporting that it stayed cool and absorbed movement well but felt firmer than the brand’s stated medium-firm rating. Her assessment suggests the mattress may suit people who prefer a firm surface, particularly back sleepers, while some side sleepers may want more cushioning around the hips and shoulders.
The Source is Simba’s entry-level natural hybrid mattress, built from wool and spring layers rather than the brand’s signature Simbatex memory foam. The review lists British and Hampshire wool, Aerocoil micro springs, a Coremax steel-sprung base and a viscose cover among its materials. It is 28cm deep, comes in four sizes from single to super king, and is designed to be rotated rather than flipped.
Oksien said she and her husband found the mattress very firm compared with the Simba Hybrid Luxe she had tested previously. She felt more as though she was sleeping on its surface than being cradled by it. Her husband, who is 6ft 4in, called it “too firm”; Oksien also found it short of cushioning for side sleeping, although she was more comfortable on her back.
The reviewer reported strong motion isolation: neither partner noticed the other getting into bed or changing position, and they did not roll towards the middle. During 10 nights of testing, neither reported waking overheated. Oksien also described the wool-and-spring mattress as less bouncy and responsive than Simba’s foam hybrids.
Who May Prefer This Firm Feel
The review highlights how a mattress’s stated tension may not match every sleeper’s experience. Simba describes the Source as medium-firm, but the reviewer and her husband experienced it as firm, with limited cushioning at the hips and shoulders. That difference matters particularly to side sleepers, who may prefer a surface that eases pressure around those areas.
On the other hand, the reported cool feel and movement absorption could appeal to people who sleep hot or share a bed. The review’s contrasting responses also show why comfort assessments are personal: Oksien’s mother, a back sleeper who likes firm natural-material mattresses, called the support “wonderful.”
These findings come from a small household test, not a controlled or large-scale comparison. They can help readers identify questions to consider, but they do not establish how the mattress will feel for everyone or verify a performance rating across different bodies and sleep habits.
natural hybrid mattress with wool and springs
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Wool and Springs Instead of Foam
The Source differs from Simba models the review identifies as better known, including the Simba Hybrid and Simba Hybrid Luxe. Those mattresses use Simbatex memory foam; the Source instead emphasizes wool comfort layers and spring support. Oksien said that construction felt flatter and less immediately springy than the foam mattresses she had tried.
The mattress has eight layers and is covered by a 200-night sleep trial, according to the review’s product specifications. Simba’s stated medium-firm description and the reviewer’s firmer impression are both relevant: one is the manufacturer’s positioning, while the other reflects a particular tester’s experience.
““My husband and I definitely rate it firm.””
— Jennifer Oksien, Ideal Home reviewer
firm natural material mattress for back sleepers
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How Other Sleepers Will Find It
The review does not establish how the mattress performs for a broad range of sleepers, body types or sleeping positions. It reports one couple’s experience and feedback from one additional tester. Individual comfort, including whether the surface feels supportive or too firm, remains subjective.
The supplied report does not give a full price comparison, long-term durability findings or results from testing beyond the stated period. It also does not provide a measured temperature comparison against other mattresses. The reported cooling and motion isolation should be read as the reviewer’s observations, not as independently quantified results.
cooling hybrid mattress with motion isolation
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Use the Trial to Judge Comfort
Readers considering the mattress can compare their own preferred firmness and sleeping position with the review’s findings, and check current product terms directly with Simba. The mattress includes a 200-night sleep trial according to the review, giving eligible purchasers time to assess comfort at home; the supplied material does not detail the trial’s conditions.
Further evidence would be needed to assess long-term durability or how consistently the mattress suits different sleepers. For now, the reported outcome is specific: a firm-feeling, breathable wool-and-spring mattress that the reviewer found effective at limiting movement, but not sufficiently cushioned for her preferred side-sleeping comfort.
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Key Questions
How long did the reviewer test the Simba Natural Hybrid Source?
Ideal Home reviewer Jennifer Oksien tested it for two weeks. The review says she and her husband spent 10 nights sleeping on it.
Did the mattress feel medium-firm?
Simba describes it as medium-firm, but Oksien and her husband said it felt firm. Their experience may not reflect every sleeper’s preference.
What did the review say about heat and movement?
Oksien reported that neither she nor her husband woke overheated during the 10-night test, and that they did not notice each other getting in or changing position. These are observations from the household test, not measured comparative results.
Who might find the mattress comfortable?
The review suggests it may suit people who like a firm surface, including some back sleepers, and who value natural materials. The reviewer found it lacked cushioning for comfortable side sleeping, while her mother, a firm-mattress-preferring back sleeper, praised its support.
Does the mattress come with a sleep trial?
The review lists a 200-night sleep trial. It does not provide the full terms, so prospective buyers should check the conditions with Simba.
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