Cocoon Sirius 3000 Cooling Encapsulated Pillowbox Pocket Sprung Mattress

The Cocoon Sirius 3000 Cooling Encapsulated Pillow Box Pocket Sprung Mattress from Sleep Express is expertly designed to deliver luxurious comfort, advanced cooling technology, and exceptional full-body support. Combining premium materials with innovative sleep technology, this luxury mattress offers the ideal balance of pressure relief, breathability, and durability, making it perfect for those seeking a cooler and more restful night's sleep.

At the heart of the mattress are 3000 individually encapsulated pocket springs, each working independently to respond to your body's natural movements. This advanced spring system provides personalised support, promotes healthy spinal alignment, and significantly reduces motion transfer, making it an excellent choice for couples and light sleepers. The encapsulated edge support reinforces the perimeter of the mattress, maximising the sleeping surface while helping to prevent edge roll-off.

A luxurious layer of Hydro-Gel Cooling Foam helps regulate body temperature by drawing excess heat away from the body, creating a cooler and more comfortable sleeping environment throughout the night. This innovative cooling technology is ideal for warm sleepers and anyone looking to enjoy a fresher, more refreshing sleep experience.

The mattress is finished with a luxurious pillow box top, adding an extra layer of plush comfort while maintaining excellent underlying support. A soft micro-quilted sleeping surface enhances comfort and secures the internal comfort layers for long-lasting durability. The breathable 3D airflow border encourages continuous air circulation throughout the mattress, helping to reduce heat build-up and maintain a healthier sleeping environment.

Designed as a single-sided mattress, the Cocoon Sirius requires only regular rotation, eliminating the need for flipping while ensuring consistent comfort and extending the mattress's lifespan.

Expertly handcrafted in the UK using premium-quality materials, the Cocoon Sirius 3000 Cooling Encapsulated Pillow Box Pocket Sprung Mattress delivers outstanding comfort, advanced cooling performance, and reliable support for years of restful sleep.

Key Features

• Medium to firm comfort support

• 3000 individually encapsulated pocket springs

• Advanced Hydro-Gel cooling foam layer

• Luxurious pillow box comfort top

• Encapsulated edge support for enhanced stability

• Breathable 3D airflow border for improved ventilation

• Soft micro-quilted sleeping surface

• Reduced motion transfer for undisturbed sleep

• Excellent pressure relief and spinal support

• Single-sided design – simply rotate regularly

• Suitable for all standard UK bed frames and divan bases

• Expertly handcrafted in the UK

• Includes a 5-Year Manufacturer's Warranty

• Free 2-Man Room of Choice Delivery (3–7 Working Days)

Ideal For

• Back and stomach sleepers

• Couples seeking reduced partner disturbance

• Hot sleepers looking for improved temperature regulation

• Those requiring enhanced spinal alignment and pressure relief

• Anyone wanting premium comfort with long-lasting durability

Dimensions

The Cocoon Sirius 3000 Cooling Encapsulated Pillow Box Pocket Sprung Mattress offers the perfect combination of cooling comfort, responsive support, and premium craftsmanship. Whether you're upgrading your master bedroom or creating a luxurious guest room, this mattress delivers exceptional pressure relief, outstanding temperature regulation, and long-lasting British quality for a healthier, more comfortable night's sleep.

Sleep Express – Premium British-Made Mattresses Crafted for Superior Comfort, Advanced Cooling & Restful Sleep.

• ❄️ Hydro-Gel Cooling Foam Layer – Gel-infused comfort layer actively disperses excess heat to maintain a cooler, more comfortable sleep temperature
• 🛏️ 3,000 Encapsulated Pocket Springs – Individually responsive springs provide zoned support, reduce motion transfer, and promote natural spinal alignment
• 🧱 Reinforced Encapsulated Edge Support – High-density foam perimeter prevents roll-off and maximises the usable sleep surface
• ⚖️ Medium to Firm Comfort Rating – Structured support with subtle cushioning, ideal for back and stomach sleepers
• 🌬️ Breathable 3D Airflow Border – Ventilated mesh design enhances circulation to reduce heat and moisture build-up
• 🧵 Micro-Quilted Comfort Surface – Smooth, plush top layer secures internal fillings while providing stable surface comfort
• 🔄 Single-Sided, Rotate Only Design – No flipping required; simply rotate periodically for even wear and long-lasting performance
• 📏 Deep Supportive Profile – Substantial mattress construction offering durability and enhanced comfort
• 🇬🇧 Proudly Made in the UK – Manufactured to trusted British quality standards
• 🚚 Free Two-Person Room Delivery – Delivered to your room of choice within 3–7 working days
• 🛡️ 5-Year Manufacturer’s Guarantee – Built for durability and backed with long-term peace of mind