FATHOM King Size Mattress Medium - 14 Inch Hybrid with Gel Memory Foam, Pocket Springs, Cool Sleep Technology, Pressure Relief, Fiberglass-Free Cover, CertiPUR-US Certified

Product Overview

The FATHOM mattress measures 80 inches long by 76 inches wide by 14 inches thick in the king size variant. It weighs 133 pounds, requiring two people for handling according to reviewers. The construction includes a quilted cover with Modal fibers for breathability and moisture-wicking. Beneath lies gel-infused memory foam to disperse heat, followed by a thin high-density memory foam layer for contouring. Durable PU foam provides stable support and ventilation. The core features dense pocketed coils that minimize motion transfer and a reinforced edge design to prevent sagging. The cover is OEKO-TEX certified, and all foams are CertiPUR-US certified, free from harmful chemicals like formaldehyde. The mattress includes stitched handles for easier movement and a built-in flame-retardant layer. It ships compressed in a box and requires 24-48 hours to fully expand. Reviewers report it works well with adjustable bed frames. The medium firmness balances softness and support, suitable for back and side sleepers. Care involves spot cleaning the cover and rotating periodically for even wear.

Design & Build

The FATHOM mattress features a 14-inch hybrid construction with multiple layers designed for durability and comfort. The top layer is a quilted cover made from breathable Modal fibers, which wick moisture and promote airflow. Beneath this, gel-infused memory foam helps dissipate heat, addressing a common issue with traditional memory foam. A thin layer of high-density memory foam provides contouring pressure relief, while durable PU foam offers stable support and ventilation. The core consists of dense pocketed coils that individually respond to movement, reducing motion transfer. Reinforced edges use additional support to prevent sagging, expanding the usable sleep surface. The mattress includes stitched handles on the sides to aid in moving its 133-pound weight. All materials are CertiPUR-US and OEKO-TEX certified, ensuring they are free from harmful chemicals. The built-in flame-retardant foam meets safety standards without fiberglass. The design prioritizes a medium firmness level, balancing softness for pressure points and firmness for support.

Care and maintenance are straightforward. The cover is not removable but can be spot cleaned with mild detergent. Reviewers recommend rotating the mattress head-to-foot every few months to ensure even wear. The mattress ships compressed in a box, requiring 24-48 hours to fully expand to its 14-inch height. Some reviewers note it reached full expansion within 24 hours. The handles, while helpful, may require careful use due to the mattress's weight. Aesthetics include a simple, neutral cover suitable for most bedding. The hybrid build aims for longevity, with materials chosen to resist sagging and maintain shape. The absence of fiberglass in the cover makes it safer for households with children or pets. Overall, the design focuses on practical features that enhance sleep quality and ease of use.

Performance

In terms of comfort and support, the FATHOM mattress delivers a balanced medium feel. Reviewers describe it as firm yet comfortable, with good pressure relief for back and side sleepers. The gel-infused memory foam effectively reduces heat retention, with many users reporting cooler sleep compared to previous mattresses. The pocketed coils minimize motion transfer, making it suitable for couples; one partner's movements rarely disturb the other. The reinforced edges provide stable support when sitting or sleeping near the perimeter, preventing the roll-off feeling common in some mattresses. However, some reviewers note the mattress is very heavy, requiring two people for setup and movement. The handles assist but may not fully mitigate the weight issue. The mattress works well with adjustable bed frames, maintaining its shape and support when inclined.

Durability and long-term performance show mixed feedback. Most reviewers praise the mattress for maintaining its comfort and shape over initial use, with no issues of off-gassing or odors. The hybrid construction aims to prevent sagging, but one reviewer reported sagging in the middle after two weeks, suggesting potential variability in quality. The 10-year warranty offers protection against defects. Temperature regulation remains consistent, with the breathable cover and gel foam keeping the surface cool. Condensation or sweat is minimal due to the moisture-wicking materials. The mattress's height of 14 inches may require deeper fitted sheets. It fits standard king-size frames without overhang. While generally quiet, the coils may produce slight noise with movement. Overall, performance aligns with its hybrid design, offering a cool, supportive sleep experience, though weight and potential sagging are considerations.