Karrimor Thermoshield Cap Color: BLACK Size: ONE SIZE Head circumference 56-60cm, Brim length 6.5cm, Height 10cm I bought this but never had a chance to use it. ◎ I have pets indoors. Please be aware if you have allergies. The following is a quote from the Karrimor website: "Using a special sheet that blocks heat rays from sunlight and providing a heat-shielding structure (Cocagel®), this cap suppresses the temperature rise inside the cap. In experiments simulating direct sunlight in midsummer, it has the effect of lowering the internal temperature by about 8°C compared to a hat without a heat-shielding sheet (in our experiments). It also cuts over 98% of ultraviolet rays (UPF50+), preventing sunburn. Ventilation is placed on the top and both sides to prevent stuffiness inside the hat and effectively prevent overheating of the head. The brim folds in the center, allowing it to be folded compactly and convenient for storage. The head circumference uses a sweatband with moisture-wicking and quick-drying functions, and antibacterial and deodorizing treatment (SEK certification)." Product number: 200180 Weight: 55g Material: Main material: 100% nylon Mesh: 100% polyester Features: UV protection Antibacterial and deodorizing Heat shielding Thank you for looking.