With its hybrid construction and customizable firmness, the Mattress Insider Alaskan King Mattress is one of the most versatile and durable oversized models available. The square Alaskan king size measures 108 inches in each direction, offering plenty of space for multiple co-sleepers and pets.
Sitting at 13.5 inches thick, the Mattress Insider Alaskan King Mattress features a flippable and modular design that lets you fine-tune the feel of the bed. The comfort system consists of 2 inches of gel-infused memory foam and a 2-inch layer of Talalay latex. Our testing team found that it offers a nice balance between moderate contouring and responsiveness. The memory foam side has a plush 1-inch quilted cotton cover, while the latex side features the same organic cotton but without the added quilting.
Beneath the comfort system sits a 1.5-inch transitional polyfoam layer followed by 6 inches of foam-encased pocketed coils. We found that the coiled core offered very good support all the way to the edge of the mattress. A final quarter-inch layer of dense support polyfoam provides added stability and support to the mattress.
The comfort system is flippable, letting sleepers choose between the plusher feel of the memory foam layer or the firmer and more responsive latex layer. The firmness level can be further customized by flipping the support core and having either the firm transitional polyfoam or extra firm base layer on top. The mattress’ zippered design ensures that the sections stay in place. Alternatively, you can choose to forgo the support core altogether and just place the comfort system on a flat surface.
Sleepers who like their mattress firm or extremely firm can omit the comfort system and sleep on either side of the support core. However, shoppers should note that the support core is shipped in two sections that must be zipped together, so there will be a small gap between the two sides. Additionally, you cannot order just the comfort system or the support core, so you should account for appropriate storage space if you don’t plan on using one of them.
The company’s Alaskan king bed ships for free anywhere in the contiguous U.S. Mattress Insider also ships to Alaska, Hawaii, U.S. territories, and Canada, but orders are subject to shipping fees. The mattress ships in three pieces, making it easier to maneuver into your bedroom. It’s protected by a 10-year limited warranty but doesn’t come with a sleep trial period.
While many oversized mattresses offer limited customization, the Alaskan King Mattress from Mattress Insider is a notable exception. Featuring a modular design with eight firmness variations, this durable bed lets co-sleepers customize each side of the expansive sleeping surface.