It is composed of hydrogel+elasticity

The hydrogel is kept at 0 ℃ and can be put in the refrigerator at ordinary times,

Take it out and wear it directly on your head,

 cold therapy 

About it 

• This is a wearable mask. It's stretchable with double seams lets it fit every face, head & eye. Cap is one size fits all. If you are not comfortable with its size return it for a full refund. TheraICE cold flexible ice pack cap provides 360° natural cooling while resting comfortably. The products slip-on design means no messy wraps or uncomfortable ice packs, inserts or awkward band straps.
• This form fitting gel ice mask wrap is brought to you by TheraICE. The reusable & wearable therapy ice pack makes it the ideal reusable cap for men, women and kids.
• The natural cold cap is one of kind in it's 360° form fitting design. Cap has no hard inserts or velcro. Just pull the cold cap over your eyes, face and head. As you lay in bed or on a couch comfortably with the product on your head, it's soft gel design won't put undo pressure on specific areas like a hard ice pack insert.
• It's a comfortable stretchable ice pack eye mask for puffy eyes. Easy to use and reuse. Simply freeze in the included zip bag for 2 hours between uses. It's thick gel and dark color . This easy-to-use cold pack is safe for daily use and ready in the freezer whenever you're ready.
• The way the gel forms to the head provides soothing comfort, simply by wearing the cap. Theraice gel ice wrap products are made with cutting-edge material & expert-grade cooling gel. Products can be worn safely on bare skin. Find comfort in this stretchable, single-piece, reusable natural cap. The one size fits all stretchable design makes it a perfect fit for everyone.