Setup and use
- Use it only with a mask or treatment whose own directions allow heat. Put the treatment on damp hair and cover it with a shower cap first; Thermal Hair Care says to wear the Hot Head over one.
- Microwave the Hot Head in 30- to 45-second bursts, flipping it between them, for about 2½ to 3 minutes in all. Never heat it for more than 3 minutes in total. The instructions in the box give the timing for your microwave's wattage.
- Put the warm Hot Head on over the shower cap and leave it for as long as your treatment's directions say.
- After use, let the cap return to room temperature. Spot clean with a damp cloth and mild detergent; use a lint roller for surface lint.
What changes your choice
The website leaves the timing for each microwave wattage to the instructions in the box, so read them before you first heat it, and stay within the 3-minute limit.
Don't use it with a conditioner or mask unless its maker says heat is fine.
Device details
- Size / format
- Adult classic fit, for short to long hair with average to full volume, the maker says; it also makes an XL and a Little Hot Head
- Heat source
- Microwave; no cord or outlet during wear
- How to heat it
- Microwave in 30- to 45-second bursts, flipping between them; about 2½ to 3 minutes in all, never more than 3
- Heat duration
- 20 to 45 minutes, the maker's earlier Onyx listing said
- Materials
- 100% cotton with flaxseed fill
- Cleaning
- Spot clean with damp cloth and mild detergent; lint roller for lint
- Included
- One adult Onyx Hot Head; the maker doesn't say whether a shower cap is included
What the maker doesn’t say
The current listing doesn't say how long the cap stays warm; its earlier Onyx listing said 20 to 45 minutes.
The listing for the cap alone doesn't say whether a shower cap comes with it. You need one under the Hot Head, so have one ready.
The maker doesn't publish the cap's measurements.
Every fact here comes from what Thermal Hair Care publishes for this product; our sources page lists each one.