Efficient Summer Relief: Scalp cooling cap with a PVC gel insert; refrigerate for quick chill; absorbs body heat fast to provide longlasting coolness and relieve summer discomfort effectively. Reusable Cooling Innovation: Cryo helmet pad; the gel withstands repeated cycles for ecofriendly temperature control; delivers longlasting performance with no frequent replacements . Versatile Hat Compatibility: Helmet cold compress; ensures compatibility with baseball caps, sunhats, and helmets; requires no modifications and offers a wide fit that adapts naturally to various headwear designs for enhanced usability. Soft and Comfortable: Freeze cap; soft on the skin, from pressure or weight; lightweight, breathable design for comfort under headwear throughout the day. Use scenarios: After outdoor activities on hot days, refrigerate the gel insert and apply to the scalp to quickly relieve heat and feel refreshed. During sports, cycling, or commuting, wear under baseball caps, sunhats, or helmets to maintain cooling without changing gear. For extended wear at work, travel, or school during heat waves, enjoy comfortable cooling under headwear with a lightweight, breathable design.