Why sheets matter most
Sheets are the layer touching your skin all night, so they have the biggest effect on how warm or clammy you feel.
Most “cooling” bedding is reactive: it wicks sweat after you are already too warm. Outlast® technology, which grew out of NASA-funded research into phase-change materials, is proactive. Microscopic phase-change materials absorb excess body heat as you warm up, store it, and release it back when you cool down — buffering temperature swings before they wake you.
Choose your fabric by feel
Every Slumber Cloud Performance sheet set is woven with Outlast®, so the cooling is the same — the difference is hand feel.
- TENCEL™: silky, smooth and drapey; great moisture management for sweaty sleepers.
- Cotton: crisp, classic and familiar; the easiest everyday choice.
- Linen blend: airy, textured and relaxed; gets softer with every wash.
What’s in a set
Each 4-piece set includes one flat sheet, one fitted sheet and two pillowcases. Twin and Twin XL include one pillowcase. King and Cal King come with king pillowcases; other sizes come with standard pillowcases.
Fit and care
Measure your mattress depth (including any topper) and check the size guide on each product page. Wash cool, tumble dry low, and skip fabric softener — it coats fibers and reduces breathability.