cold cap

Common categories found in product text include evaporative cooling sun hats that use a wet-to-cool liner, gel bead eye masks for hot-or-cold use around the eyes, and form-fitting reusable gel ice/headache caps that wrap over the head and face.

These caps use frozen gel packs or a soft gel insert. Product instructions state freezing the included pack for about 2 hours between uses, and the designs are described as reusable.

Evaporative cooling hats are described as packable, quick-drying, and machine-washable. To reactivate cooling, wet the inner liner (soak and wring or dampen and wave) and then allow it to dry; the evaporative cooling effect is renewed when the liner is wet.

Product text notes that cold therapy should not be used for more than 20 minutes at a time and advises following the product instructions. Some descriptions also reference daily-use compression features but still recommend following manufacturer directions for safe use.

Evaporative cooling caps use a wet-to-cool liner you soak, wring out, and wave to activate evaporative cooling. Product text states this method can lower head temperature by up to about 20°F and that the cooling can last roughly 5–10 hours after activation.

Many products cover the eye area and surrounding face (forehead and temples) and are designed to pull over the full head; a few form-fitting caps also describe additional head-and-neck coverage.

Common fit features include adjustable head and chin straps, stretch or form-fitting one-size-fits-most designs, ponytail openings, four-way-stretch fabrics, and interior sweatbands for a snug, secure fit.