Most cooling pillowcases are chemically coated polyester — the coating washes out in 3 to 6 cycles. The Halo uses structurally woven ice silk: cooling that's identical at wash 1 and wash 200. Different physics. Different result.
Cool the second your head hits it. The same ‘cool side of the pillow’ feeling — but it doesn’t run out. No flip required. (Hours 1 to 2.)
When the body heats up mid-sleep — heat, hormones, or stress — ice silk wicks moisture away from the skin instead of trapping it. The pillow stays dry. You stay asleep. (Hours 3 to 8.)
The cooling is woven into the ice-silk fiber, not sprayed on top. There is nothing on the surface to wash out. Machine wash cool. Tumble dry low. Forever.