Yawnder Reviews · Original review material restored September 2026
Archived original cooling-foam testing
Muse Sleep has been consolidated into Viscosoft, but the older Muse mattress review contained real thermal-camera, motion and construction testing.
Medium-firm dense foam
Yawnder reviewed the medium Muse. Its upper memory foam was relatively dense, producing strong pressure relief with slower recovery than more responsive foams.
Cold Wire cover
The standout feature was the phase-change-style cooling cover. In our infrared-camera test, surface heat dissipated quickly after contact.
Original Muse mattress thermal camera demonstration
This short demonstration shows surface heat after contact on the older sample; it does not establish overnight sleeping temperature.
Four-layer foam design
The reviewed model used gel-infused memory foam, additional memory foam and a high-density support core under the cooling cover.
Inside the original Muse mattress
A look at the foam layers in the mattress we reviewed.
Motion isolation
Dense foam absorbed movement extremely well, making the mattress quiet and stable for couples.
Original Muse mattress bounce demonstration
This shows how the older sample responds to a ball drop; it is not a standardized motion-isolation score.
Limited sink
The medium version did not sink as deeply as many softer foam beds, which also reduced how much mattress material surrounded the body.
This original video shows the older Muse foam mattress; availability and terms may have changed.
Watch the original overview on YouTube →
Current support and warranty
Viscosoft says it supports Muse Sleep customers and honors eligible warranties under the original terms. Contact its support team with your order information and relevant photos. Confirm eligibility and terms directly before relying on coverage.
Frequently asked questions
Is the original Muse mattress still sold?
The original review is historical. Viscosoft says the MuseSleep website is no longer active; check directly for current product availability.
Does the cooling-cover test predict overnight sleep temperature?
No. The historical infrared demonstration shows surface behavior under that test’s conditions, not a guarantee of how cool a person will sleep.
Was the reviewed Muse a hybrid?
No. The original model described in this review used foam layers rather than a coil support unit.
Current-shopping note
Muse Sleep is archived. This page preserves the mattress Yawnder actually tested and should not be read as current Viscosoft product guidance.
Yawnder Reviews · Disclosure: Some links may be affiliate links. Current specifications and policies can change.
Compare this mattress against 142 tested mattresses
Sort all 142 mattresses we have tested by pressure relief, support, cooling, motion isolation, edge support, price, trial and warranty, then filter by how you actually sleep. Of those, 84 hold a complete standardized record and 41 a partial standardized record.