【Perfect Size】-37.4”diameter wide enough to keep your head and arms and also the things you are carrying dry or shaded. Close as a usual umbrella(9.8 inches,9.2 oz) which is very portable. ※For its large diameter please do not use when wind is strong. 【Adjustable Chin Strap】-This hat has an adjustable chin strap to help you wear it more comfortable and stable. Fit for most grown-ups’ head(heads between 7.1-7.9 inches in diameter).Come with a Spring-Stop lanyard cord lock to hold it tightly in place under your chin. 【Heat Reflective Cloth】-Silver coating cloth top will bounce sunlight off so it don’ absorb heat much. There is a vent to facilitate ventilation which keeps you cooler from strong sunlight. 【Easy to Use】- Pull the rope on the top to open;press the button when you open the umbrella as normal one does it will automatically retract. Steps in details please refer the pic in our item page. 【Widely Used】 -Perfect for Gardening, Hiking, Fishing, Farming, Golfing, Photographing, Painting, Shooting Mailman and a Jelly Fish Halloween Costume etc. Great Novelty Gift for your father, mother and friends.