Two metal buckle, tie the strap to your hat tightly. The spring loaded stop cord lock adjust the length of the strap. Removable and flexible chin cord, universal fit any kind of hat. Size??About 40*2cm. Adjustable strap lock for different length. A great and necessary removable strap for your fishing hat, hunting hat, sun hat, and so on to protect your hat from blowing away. With this little tool,enjoy yourself in many kind of outdoor sports, fishing, hiking, camping, travel.