Flex Nube Junior B Kids Mattress

Kids pocket spring mattress with breathable upholstery | Height: 18 cm

Flex Nube Junior B Kids Mattress

50%

OFF

save 50% was €618.00

€309.00 VAT included.

Pay in up to 24 installments of €12.88/month INTEREST FREE! (+ info)

Free shipping

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save 50% was €618.00

€309.00 VAT included.

Pay in up to 24 installments of €12.88/month INTEREST FREE! (+ info)

Free shipping

Have you seen this product at a better price?
marca Flex

*Offer available until 16 of June


    FREE Shipping

    - On all Shipments in the Peninsula.

    - Delivery to the Balearic Islands may entail an extra cost. (*See conditions)

    - If you have any questions, consult one of our advisors through the chat, on our toll-free number: 900 897 956.

    3 Years Warranty

    This product has a 3 year warranty

    Now also with Bizum

    You can now pay with Bizum at Colchón Exprés. If this is the first time you use Bizum for your online payments, follow the steps that we indicate here.

    Finance up to 40 months

    Pay up to 40 months WITHOUT INTEREST.

    * See conditions


Details

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.

Choose Options & Buy

  • book a call with our experts
  • Book a call with our experts

    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.


Learn more about the Cloud Junior B Mattress

cut of the junior b flex cloud mattress
  • 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.

Product technical info

Advantages


Firmness

Firmness

Medium-high

Pocketed-pocket spring

Pocket-pocket spring

More adaptable and independent spring system. Each spring is wrapped in a special bag, offering independent support from the rest of the springs and superior adaptation to each area of ​​the body.

 

Technical info


  • Ideal for: Lower bunk of cabin beds and bunk beds
  • Firmness: Adaptive — conforms to each part of the body
  • Upholstery: Hypoallergenic fibres and ergonomic materials for a comfortable, cushioned feel
  • Core: Minipocket Spring pocket spring block, 8 cm — one of the few kids mattresses with a genuine pocket spring core
  • Highly breathable: Pocket springs and upholstery layers promote continuous airflow throughout the mattress for a fresher night's sleep
  • Height: approx. 18 cm

Choose Options & Buy

Sanitized Treatment

Sanitized Treatment

Sanitized® Certificate: Which guarantees that the materials used in its manufacture are respectful of humans and the environment

Member of ASOCAMA

Member of ASOCAMA

Mattress comparison

Cloud Junior B Mattress Cloud Junior Visco A Mattress Kubrix Youth Mattress
Select brand:
Select model:
Select brand:
Select model:
Cloud Junior B Mattress(View product) Cloud Junior Visco A Mattress(View product) Kubrix Youth Mattress(View product)
Marca
Brand Marca Flex Marca Flex Marca IngravityKids
Firmeza
Firmness 8 / 10 8 / 10 9 / 10
Precio
Precio €30900 €36900 €27900
Galardon
Galardon - - Best Quality-Price Mattress for Children
Tejido Exterior
Tejido Exterior
  • Stretch
  • Stretch
  • Tejido Exclusivo Ingravity Kids Antimanchas
Capas del Acolchado
Capas del Acolchado
  • Hypoallergenic fibers and Comfort System
  • Viscoelastic
  • Hypoallergenic Fibers
  • Comfort System
  • Side A: Fisiocell® Anatomical Profile; Side B: High density memory foam
Núcleo
Núcleo
  • Minipocket Spring pocket springs 8 cm high
  • 8cm Minipocket Spring pocket springs
  • Profiled high-density Fisiocell® block
Encapsulado perimetral
Encapsulado perimetral Si Si No
¿Es desenfundable?
¿Es desenfundable? valor negativo valor negativo valor positivo
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? valor negativo valor negativo valor positivo
¿Es simétrico?
¿Es simétrico? Si Si No, Colchón de 2 caras diferentes
IMC's Recomendados
IMC's Recomendados
  • IMC bajo
  • IMC normal
  • IMC bajo
  • IMC normal
  • IMC bajo
  • IMC normal
Soporte más recomendado para este colchón
Soporte más recomendado para este colchón
  • Base Tapizada,
  • Canapé Abatible
  • No recomendado somier de láminas ni camas articuladas
  • Base Tapizada,
  • Canapé Abatible
  • No recomendado somier de láminas ni camas articuladas
Todo tipo de bases y somieres.
¿Admite la opción de colchones gemelos?
¿Admite la opción de colchones gemelos? valor negativo valor negativo valor negativo
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? valor negativo valor negativo

Al comprar este colchón llévate de REGALO una almohada juvenil de fibra.

Customer reviews

(4)

CATHERIN19-05-2026

SUPER SPRING MATTRESS. I couldn't buy a better one, perfect for the guest bed, suitable for children and adults.

LORETO19-05-2026

THIN AND WITH SPRINGS. PERFECT FOR MY SON IN HIS trundle bed,

PEDRO19-05-2026

I VERY LIKED THAT IT WAS HYBRID. I couldn't find a mattress to put on a trundle bed with springs that fine, and the truth is that it is very well made.

ROGELIO19-05-2026

GREAT. I HAVE ALWAYS TRUSTED THE FLEX BRAND AND FOR MY SON, I HAVE WANTED THE SAME. THEY DO NOT DISAPPOINT

Express Shipping in 48/72 hours

express shipping on ingravity mattresses

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

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

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

double 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.