Slumbercloud Dryline Protector

The best for hot sleepers — active temperature-regulating, moisture-wicking fabric (often Outlast tech) over the waterproof barrier that absorbs and releases heat to actively keep you cool and dry. Solves the trapped-heat sweatiness of waterproof protectors; premium but justified for hot sleepers.

The SlumberCloud Dryline Protector is the pick for hot sleepers, adding active temperature regulation to waterproof protection. It uses moisture-wicking, temperature-regulating fabric (often incorporating Outlast phase-change technology, which originated in NASA-funded research) on top of its waterproof barrier, which actively absorbs and releases heat and wicks away sweat — so instead of the trapped-heat sweatiness that plagues many waterproof protectors, it actively helps keep you cool and dry. For someone who sleeps hot, sweats at night, or lives somewhere warm, it solves the single biggest complaint about waterproof layers. It's breathable, quiet, and machine washable, at a premium-but-justified price. It's a fitted-style protector (not an encasement, so no bed-bug barrier), but for cooling plus protection, it's the standout for hot sleepers.

▶ Video review

Slumber Cloud Dry Line Mattress Protector Review - A Seriously Comfy Mattress Protector