120-night sleep trial with comfort guarantee
Free shipping on orders over €49
Finance your purchase for up to 40 months interest-free
The Flex Nube Junior B kids mattress delivers outstanding comfort and breathability for younger sleepers, making it one of the very few kids mattresses to feature a genuine pocket spring core. Its compact Minipocket Spring block (8 cm) has been specifically engineered for this model, making it possible to achieve a slim 18 cm profile — perfectly sized for the lower bunk of a cabin or bunk bed without compromising on sleep quality.
The pocket spring construction, combined with the hypoallergenic fibre and ergonomic upholstery layers, promotes constant airflow throughout the mattress interior. This keeps the sleep surface fresh and free from that stuffy, overheated feeling that thinner foam mattresses often trap — a meaningful benefit for children who tend to sleep warm or move frequently during the night.
With its adaptive, body-contouring feel and excellent value for money, the Flex Nube Junior B is an ideal choice for equipping a cabin bed or bunk bed with a durable, breathable and genuinely comfortable mattress. It also pairs naturally with the Nube Junior Visco A (20 cm) for the upper bunk, giving young sleepers a well-matched, high-quality sleep setup from top to bottom.

Do you need help? Book a free call, at a time and day that suits you, with one of our experts, from one of our physical stores. We will listen to your needs and tell you which mattresses or pillows best adapt to your way of sleeping, without any commitment.

Recyclable Polyeter
Support material that provides stability to the upper layers of the mattress and helps to improve its resistance and durability over time.
Hypoallergenic Fibers
Layer of breathable fibers that promotes air circulation and helps maintain a balanced temperature during rest, providing a soft and comfortable welcome.
Total Protect Treatment
Hygienic system that acts against mites, bacteria and fungi, helping to keep the mattress in better hygienic conditions and promoting healthier rest.
Confort System®
High-density material that distributes weight evenly over the surface of the mattress, improving stability and adaptation to the body.
Pocket Premium® Mini Pocket Spring 8 cm
Individually pocket spring core that provides independence of movement and a progressive firmness adapted to the weight of the body.
| Cloud Junior B Mattress | Cloud Junior Visco A Mattress | Kubrix Youth Mattress | |
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Select brand: Select model: | Select brand: Select model: | ||
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| Marca | |||
| Brand | ![]() | ![]() | ![]() |
| Firmeza | |||
| Firmness | 8 / 10 | 8 / 10 | 9 / 10 |
| Precio | |||
| Precio | €30900 | €36900 | €27900 |
| Galardon | |||
| Galardon | - | - | Best Quality-Price Mattress for Children |
| Tejido Exterior | |||
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| Capas del Acolchado | |||
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| Núcleo | |||
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| Encapsulado perimetral | |||
| Encapsulado perimetral | Si | Si | No |
| ¿Es desenfundable? | |||
| ¿Es desenfundable? | ![]() | ![]() | ![]() |
| Tratamientos termorreguladores | |||
| Tratamientos termorreguladores | - | - | Platabanda con tejido 3D |
| Transpirabilidad | |||
| Breathability | 9 / 10 | 8 / 10 | 9 / 10 |
| ¿Es idóneo para camas articuladas? | |||
| ¿Es idóneo para camas articuladas? | ![]() | ![]() | ![]() |
| ¿Es simétrico? | |||
| ¿Es simétrico? | Si | Si | No, Colchón de 2 caras diferentes |
| IMC's Recomendados | |||
| IMC's Recomendados |
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| Soporte más recomendado para este colchón | |||
| Soporte más recomendado para este colchón |
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| Todo tipo de bases y somieres. |
| ¿Admite la opción de colchones gemelos? | |||
| ¿Admite la opción de colchones gemelos? | ![]() | ![]() | ![]() |
| Período de garantía | |||
| Período de garantía | 3 años | 3 años | 3 años |
| Altura | |||
| Altura | 18 cm | 20 cm | 20 cm |
| ¿Cupón promocional especial activo? | |||
| ¿Cupón promocional especial activo? | | | Al comprar este colchón llévate de REGALO una almohada juvenil de fibra. |
Express Shipping in 48/72 hours
The Express Shipping Service in 48/72 hours, for this mattress, is available throughout the Peninsula and the Balearic Islands.
The Mattress will be sent vacuum packed.
* This Service is incompatible with the Old Mattress Removal Service.
120 Night Trial
At Colchón Exprés we want you to try your mattress comfortably at home. That's why we offer a 120-night trial on our best-selling mattresses.
If you're not convinced, you can exchange it for another one of the same size that you like better, before the trial period ends.
Check the 120-night trial terms and conditions to find out all the details of the promotion.
Interest-Free Financing
Pay in up to 40 months Interest-Free. You can finance any order from €90, as long as the minimum monthly payment is at least €12.
Super convenient. We'll call you and one of our advisors will guide you through the financing process over the phone.
No strings attached. You can make early payments whenever you want, with no penalties or hidden tricks.
Your data protected. We don't sell your data to third parties.
For more information you can click here.
DOUBLE Sonpura Promotion
If you buy a Sonpura mattress together with a Sonpura Base, Fixed Canapé or Folding Canapé, of the same size, you will have:
45% Discount on the Base or Canapé, instead of the usual 30% (this discount will be applied directly in your cart).
5 year warranty on your equipment. rest.
*Promotion not applicable to Sonpura mattresses from the Micro range (Gaudí, Royal, Carisma and Titán) nor to the Spirit and Silence models from the Multiadapt range.