Sheets and next-to-skin fabrics
Fibers & yarns
Outlast® is embedded into fibers, then spun into yarn and woven or knitted into the fabric touching your skin.
Outlast® technology
It’s bedding that keeps you warm but also cool.
Which sounds like magic, but is just science.
A responsive material inside the bedding absorbs, stores and releases heat as your body temperature changes—before discomfort turns into another wake-up.
Shop Outlast® bedding by Slumber CloudThe problem
Cooling after you sweat is already too late.
Reactive cooling
Breathable and moisture-wicking fabrics help air and sweat move after your body is already warm. Useful, but reactive.
Proactive regulation
Outlast® buffers rising heat before sweat starts, then responds again when your temperature falls. It manages the cause, not only the moisture.
A continuous cycle
Absorb. Store. Release. Repeat.
Inside the fabric are millions of microscopic capsules containing phase-change material. Think of ice keeping a drink near the same temperature as it melts: the change of state takes in energy without the temperature continuing to climb.
01
Absorb
As your skin warms the bed, millions of microscopic Outlast® capsules begin taking in excess heat before it becomes a sweaty wake-up.
02
Store
The material changes phase and holds that thermal energy instead of letting it build around your body.
03
Release
As your temperature drops, the capsules change back and release stored warmth. The cycle repeats through the night.
The origin story
A fabric designed for NASA’s most extreme temperature problem.
In the late 1980s, NASA funded research into phase-change materials for spacesuit gloves exposed to dramatic temperature swings. This research was later licensed and commercialized as Outlast® technology—bringing that thermal-buffering idea into everyday materials.
NASA-funded origins
Born from research into more stable temperatures inside spacesuit gloves.
Responsive in both directions
Takes in excess heat and gives stored warmth back as conditions change.
Material science, made useful
A technical idea translated into soft, washable layers for the whole bed.
Built differently by layer
The same idea, applied three ways.
Outlast® is not one generic finish. It can be integrated into fibers, soft fill, or a printed coating depending on where each layer sits and how quickly it needs to respond.
Comforters and blankets
Temperature-regulating fill
The technology is built into soft filling so the layer above you can buffer heat without feeling heavy or rigid.
Pads, pillows and covers
Printed coatings
A high-capacity coating is applied across the fabric surface where it can quickly respond to heat close to your body.
The Slumber Cloud sleep system
Temperature regulation at every layer.
A single cooling layer can help. A bed built to manage heat from the mattress up gives your body fewer places for warmth to collect.
01
Mattress pads
Buffer heat rising from the mattress beneath you.
Shop mattress pads02
Sheets
Place responsive fibers directly against your skin.
Shop sheets03
Comforters
Manage warmth in the layer that holds the most air.
Shop comforters04
Pillows
Draw excess heat away from your head and neck.
Shop pillowsThe simple version
Your body is the reactor. Your bedding is the heat sink.
Sorry—we got technical. It just helps keep your bed comfortable through the night.
Is Outlast® the same as moisture wicking?+
No. Wicking moves moisture after sweat forms. Outlast® begins working earlier by absorbing excess heat before it can build. Many Slumber Cloud fabrics also wick moisture, so the two technologies can work together.
Does it only work for hot sleepers?+
No. Phase-change material works in both directions: it absorbs heat when you are warm and releases stored warmth when you cool. That makes it useful across seasons and for partners with different sleep temperatures.
Does the technology wash out?+
The absorb–release cycle is designed to work continuously and repeatedly. Follow the care label for your specific product, use mild detergent, and skip fabric softener, which can coat fibers and reduce breathability.
Was Outlast® used in space?+
Its origin is NASA-funded research from the 1980s into phase-change materials for spacesuit gloves. NASA says the prototype material was not incorporated into equipment launched into space; the research was later licensed and commercialized.
Feel the difference for 30 nights.
Free U.S. shipping and returns, with time to wash it, sleep on it, and decide in your own bed.