Helix Midnight Mattress - California King 84x72, 11.5" Medium-Firm Hybrid, Memory Foam & Pocketed Coils, Pressure Relief, Cooling Cover

Product Overview

The Helix Midnight mattress measures 84 inches long by 72 inches wide by 11.5 inches thick in the California King size, weighing approximately 140 pounds. Its hybrid construction includes three foam layers over hundreds of individually wrapped steel coils. The top layer uses SupremeSupport 2.5 Memory Foam, which the manufacturer claims provides 2.5 times more cushioning than standard memory foam. A breathable Breathe Knit cover pillow top enhances airflow to help regulate temperature. The mattress has a medium feel rated 6 out of 10 on the firmness scale, with 10 being the firmest. It is designed to contour to the body's curves while maintaining enough support to keep the spine aligned. The reinforced side perimeters help prevent sagging and make getting in and out of bed easier. The mattress is compressed, rolled, and shipped in a box for convenient delivery and setup. It is fiberglass-free, GREENGUARD Gold certified for low chemical emissions, and made with CertiPUR-US certified foams. The product is assembled in Arizona and sold directly to consumers.

Design & Build

The Helix Midnight mattress features a three-layer hybrid design with a total thickness of 11.5 inches. The top comfort layer uses SupremeSupport 2.5 Memory Foam, which the manufacturer describes as providing 2.5 times more cushioning than standard memory foam. This layer is designed to contour closely to the body, particularly targeting pressure points at the shoulders and hips for side sleepers. Beneath this, additional foam layers transition to the support core of hundreds of individually wrapped steel coils. These pocketed coils move independently to isolate motion and provide zoned support. The coils are surrounded by reinforced side perimeters that enhance edge support and durability. The entire mattress is encased in a Breathe Knit cover pillow top, which adds a plush surface feel while promoting airflow through its breathable fabric. The cover is removable for cleaning, though specific care instructions should be checked. The mattress is finished in a white and brown color scheme, giving it a neutral aesthetic that fits most bedroom decor.

Construction emphasizes safety and environmental standards. The mattress is fiberglass-free, avoiding the skin and respiratory irritation risks associated with some fire barriers. It holds GREENGUARD Gold certification, indicating it meets strict limits for volatile organic compound emissions, contributing to better indoor air quality. All foams are CertiPUR-US certified, ensuring they are made without harmful chemicals like ozone depleters, heavy metals, or formaldehyde. The mattress is assembled in Helix's own facility in Arizona, allowing quality control before shipping. It is compressed, rolled, and vacuum-sealed into a box for delivery, which reduces shipping costs and makes handling easier. Once unboxed, the mattress expands to its full dimensions, though it may take up to 72 hours to fully off-gas and reach its intended firmness. The design prioritizes durability, with materials chosen to resist sagging and maintain support over years of use.

Performance

The Helix Midnight mattress performs well in providing balanced comfort and support, especially for side sleepers and combination sleepers. Its medium feel, rated 6 out of 10 on the firmness scale, offers enough softness to cushion pressure points while maintaining sufficient firmness to keep the spine aligned. The SupremeSupport 2.5 Memory Foam layer contours to the body's curves, reducing discomfort at the shoulders and hips, which is critical for side sleeping. The hybrid construction combines the contouring benefits of foam with the responsiveness of coils, making it easier to change positions during the night. Motion isolation is a strong point due to the individually wrapped coils, which absorb movement and minimize transfer across the mattress surface. This makes it suitable for couples where one partner is restless or has different sleep schedules. The reinforced edges provide stable support, preventing the feeling of rolling off and increasing the usable sleep area. The breathable knit cover and airflow through the coil system help regulate temperature, though it may not be as cooling as specialized gel-infused foams.

Durability and long-term performance are supported by the quality materials and construction. The pocketed coil system is designed to maintain its shape and support over time, reducing the risk of sagging in the center or along the edges. The foam layers are CertiPUR-US certified, indicating they should retain their resilience without significant compression. The mattress's weight of 140 pounds for the California King size suggests a substantial build that may resist shifting on the bed frame. However, as a bed-in-a-box model, some initial off-gassing odor is common, though it typically dissipates within a few days. The mattress works with most standard bed frames, including adjustable bases, but compatibility should be verified. Its 11.5-inch profile may require deep-pocket sheets. The lack of reviews means real-world performance data on factors like heat retention or long-term comfort is limited, so prospective buyers should rely on the sleep trial to assess suitability. Overall, the mattress aims to deliver a supportive yet pressure-relieving sleep experience tailored to side sleepers and those who move during the night.