EMMA + OLIVER Astor King Premium Mattress in a Box - 8" Hybrid Innerspring, CertiPUR-US Certified Foam, Medium Firm Support, Knit Fabric Top, King Size 81"L x 75.5"W

Product Overview

The EMMA + OLIVER Astor King Premium Mattress measures 81 inches long by 75.5 inches wide by 8 inches thick, fitting standard king-size bed frames. It weighs 82 pounds, which is manageable for setup but may require two people for lifting. The mattress features a two-layer construction: a comfort foam top layer and a base layer with 700 continuous coil innersprings. The cover is made of knit fabric, providing a breathable and soft surface. Fill materials include gel memory foam and comfort foam, with overall materials comprising fabric, felt, foam, and steel. It is CertiPUR-US certified, ensuring the foams meet standards for content, emissions, and durability. The mattress ships compressed in a box, expanding to full size after removal from packaging; the manufacturer recommends allowing 48 to 72 hours for complete expansion. Care instructions specify hand washing only for the cover. The medium firmness level targets back and stomach sleepers or those who need more support, though individual comfort may vary. Its hybrid design promotes airflow through the coils, potentially reducing heat retention compared to all-foam models. The mattress is not foldable, so it requires adequate space for unboxing and expansion. It is designed for adult use and fits various bed types, including platform beds, bunk beds, RVs, and trundles, making it versatile for different sleeping environments.

Design & Build

The EMMA + OLIVER Astor King Premium Mattress features a straightforward two-layer hybrid construction. The top layer consists of comfort foam, designed to provide initial cushioning and pressure relief. Below this, a base layer incorporates 700 continuous coil innersprings made from heavy-gauge tempered steel, offering foundational support and bounce. The coils are arranged in a continuous system, which can enhance durability and motion isolation compared to some pocketed coils. The entire mattress is wrapped in a knit fabric cover that is soft to the touch and promotes breathability. This cover is removable only for hand washing, as per care instructions, which may limit deep cleaning options. The mattress measures 8 inches in thickness, making it a relatively low-profile option that works well with low-height bed frames or bunk beds. Its 82-pound weight is manageable for setup but may require assistance due to the size. The design emphasizes practicality, with no extra frills like pillow tops or advanced zoning, focusing instead on core materials for a budget-friendly price point. Aesthetics are minimal, with the knit cover providing a clean, neutral look that fits most bedroom decors.

Build quality centers on the hybrid materials: foam and steel. The CertiPUR-US certification of the foams ensures they are free from harmful chemicals and meet performance standards. The continuous coil system uses tempered steel for resilience, aiming to prevent sagging and maintain shape over time. However, some reviewers note concerns about durability, with one mentioning 'low quality,' though specifics are sparse. The mattress ships compressed in a box, which reduces shipping costs and eases delivery, but the compression process may affect initial expansion; allowing 48 to 72 hours for full expansion is crucial. The knit fabric cover is durable for daily use but requires gentle care. Edge support is likely moderate due to the coil design, which may not be as reinforced as higher-end hybrids. Overall, the build prioritizes essential components for a functional mattress, suitable for those who value simplicity and cost-effectiveness over luxury features.

Performance

In terms of comfort and support, the EMMA + OLIVER Astor King Premium Mattress delivers a medium-firm feel, as described by the manufacturer. The hybrid design combines the responsiveness of innerspring coils with the contouring of foam, aiming to provide balanced support for back and stomach sleepers. The 700 continuous coils offer good bounce and airflow, which can help reduce heat retention—a common issue with all-foam mattresses. The comfort foam layer adds slight pressure relief, though it may not be as plush as memory foam in premium models. Reviewers have limited feedback, but one mentioned 'low quality,' suggesting potential issues with durability or comfort consistency. The mattress likely performs adequately for its price range, offering decent motion isolation due to the foam layer, though couples might experience some transfer from the continuous coil system. Firmness may vary with body weight and sleep position, so lighter sleepers might find it firmer than expected. The 8-inch profile provides sufficient support for most adults, but heavier individuals may desire more thickness or layering for optimal comfort.

Durability and maintenance are key performance aspects. The heavy-gauge steel coils and high-density foam are designed for longevity, but the limited review data makes long-term assessment uncertain. The CertiPUR-US certification suggests the foams should resist premature sagging and maintain integrity. The knit fabric cover is breathable and easy to spot-clean, though hand wash-only care may be inconvenient for stains. Expansion performance is critical; following the 48- to 72-hour allowance ensures the mattress reaches its intended firmness and dimensions. Some bed-in-a-box mattresses may off-gas initially, but the certified foams likely minimize odors. The mattress fits standard king frames well, but its 75.5-inch width is slightly narrower than some king sizes, so checking bed frame compatibility is advised. For RVs or bunk beds, its low height and compressed shipping are advantageous. Overall, performance aligns with budget hybrid mattresses, offering functional support and convenience, though potential quality concerns from reviews warrant consideration.