In 3 key points



Advanced Thermoregulation Technology


Home Progressive and firm support


Memory technology and precise gauge spring

Immerse yourself in the world of the THALASSA Mattress

An invitation to rediscover quality sleep. Designed to meet the expectations of the most demanding, this mattress brilliantly combines enveloping comfort and optimal support. The premium materials and innovative structure promise nights of deep and restorative rest.

With the THALASSA Mattress, each awakening is a rebirth, preparing to face the day with energy and serenity.

The THALASSA Mattress reveals its secrets

Each layer is a layer of comfort and well-being, designed to provide an unparalleled night's sleep. Cutting-edge technology and craftsmanship come together to create a nighttime haven.

The quiet 220 g/m² ticking envelops the mattress, providing a soft contact surface and reducing noise for peaceful, uninterrupted sleep.

The bed, with its 200 gr/m² filling, reinforces the sides of the mattress, ensuring a stable shape and increased durability .

This comfort foam layer provides a soft first response to the body, evenly distributing weight to relieve pressure points.

Ultrasoft foam, enriched with 200 g/m² of fibers, creates an exceptionally soft layer , increasing immediate comfort from bedtime.

Memory foam adjusts to the contours of the body, providing personalized support and reducing pressure points for restful sleep.

Pocket springs ranging from 465 to 957, to maintain even weight distribution . They act independently to provide adaptive support to each part of the body, improving sleeping independence and reducing motion transmission.

A second layer of comfort foam, identical to the third layer , provides uniform support across the entire surface, reinforcing the effect of lasting comfort .

The eighth layer , made of a robust 200 gr/m² polyester fabric, incorporates a non-slip side essential to the stability of the mattress. This feature ensures that the mattress stays firmly in place on the box spring, eliminating slipping and thus ensuring increased safety and extended durability . The fabric also offers effective protection while promoting good ventilation for a healthy and comfortable sleeping environment.

Adopt the THALASSA Mattress for transformed nights

More than just a mattress, THALASSA is the symbol of superior quality rest, elegantly combining comfort , softness and firm support . It’s the assurance of restful sleep that allows you to wake up full of energy, day after day. Don't compromise your nighttime well-being; choose THALASSA for nights enveloped in comfort and support .


Opting for THALASSA means choosing a superior quality of sleep, where every detail is thought of for your ultimate comfort. Embark on a renewed sleep experience, where every night is a promise of softness and support.

Environmental Commitments and Quality Standards

Complies with CERTIPUR , OEKO-TEX , and AFNOR standards, ensuring safety and respect for the environment.

Why Choose the PROMETHEUS Hybrid Mattress ?

Our mattress is at the forefront of innovation , respecting CERTIPUR, OEKO-TEX standards , comfort , and environmental commitment are our key words, ensuring superior quality while guaranteeing the absence of harmful substances . Choose excellence for peaceful and eco-responsible nights.

We're giving you 14 nights to try it . If for any reason it does not fully meet your expectations, contact us. Not only will we refund you in full , but we will also collect the order from your home . Your peace of mind is our priority.

The confidence we have in our Douce Lune® products is reflected in our generous warranty . Your mattress comes with a 10-year warranty , covering all manufacturing defects and sagging . Because we believe in the sustainability and quality of what we create.

We want your shopping experience to be as smooth as our mattresses. That's why we offer free shipping and returns . Our ordering process is simple, fast, and hassle-free.

With our fee-free payment option in 4 installments , you can spread your investment over several months without worrying about additional interest . It's simple and transparent .

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  • 14 night trial
  • Free delivery & returns
  • 10 year warranty