Buffy Cloud Cooling Comforter for Hot Sleepers, Eucalyptus Lyocell Temperature-Regulating Duvet Insert (King/Cal King) Review (2026)

Who this comforter fits

The Buffy Cloud in King/Cal King is aimed at hot sleepers who want a fuller, all-season comforter rather than a bare-minimum summer throw. Because it uses a temperature-regulating eucalyptus lyocell shell, it suits people who run warm but still like the look and loft of a traditional duvet insert, including couples on a large King or Cal King bed who need the extra width to avoid tug-of-war with covers. It is less suited to anyone who sleeps very hot year-round or who mainly wants a thin cooling layer for a few peak summer weeks, since the loft and fill still add measurable warmth compared with a lightweight cooling blanket or a bare sheet.

Cooling fabric and fill

The shell is a 300 thread count sateen weave made from 100 percent eucalyptus lyocell, a fiber Buffy markets for moving heat and moisture away from the body faster than cotton. Inside is a recycled polyester fill rated at roughly 700 fill power equivalent and 300 gsm fill weight, giving the comforter noticeable loft rather than a flat, paper-thin feel. Lyocell fabrics of this type are generally more breathable than cotton because of how the fibers are processed, which is the basis for Buffy's cooling and moisture-absorption claims for this line. That combination of a cooling shell with a fuller fill is why this model reads as warmer than Buffy's dedicated Breeze comforter, which drops the heavier fill in favor of a thinner, lighter build.

Sizing and construction

King/Cal King measures 90 by 105 inches, sized to overhang a King or California King mattress on both sides the way a duvet insert typically should. Buffy uses a stitching pattern designed to keep the fill evenly distributed across the surface so it resists clumping into cold spots after repeated washing, which is a common failure point in lower-cost alternative-fill comforters. As a duvet insert rather than a standalone comforter, it is built with corner ties or tabs so it can be secured inside a duvet cover, which also protects the shell from direct body oils and makes color changes easier without buying a new insert.

Care and ownership experience

Buffy states the Cloud comforter is machine washable in cold water and can be dried on low heat or air fluff, which is more convenient than comforters that require dry cleaning or a trip to a laundromat with an oversized machine. Buffy backs its comforters with an in-home trial period and a return window, which matters for a product like this where fit and warmth preference are personal and hard to judge from a listing alone. Because it is a duvet insert, most owners will still want a separate duvet cover to protect the shell between washes and to change the look of the bed without buying a second comforter.

Value verdict

The Buffy Cloud costs more than a generic polyester cooling insert, and that premium buys a recognizable direct-to-consumer bedding brand, a cooling-oriented lyocell shell, and a fuller loft than most budget cooling comforters offer. For hot sleepers who still want real warmth and weight from their comforter, that combination is a reasonable trade. Anyone whose main goal is the coolest possible night, with warmth a secondary concern, should compare this against Buffy's own Breeze model or a thinner cooling blanket before committing to the fuller Cloud fill in King/Cal King.

Frequently asked questions