The finger cap slips over the top to prevent gaps when your fingers are not left out, keeping cold air out.The wrist has an adjustable strap and a cord that can be tightened at the cuffs for excellent protection against the cold. In addition, the plastic hook allows you to connect the right and left gloves so you dont have to worry about losing one side. Wear it and enjoy your winter shots! For compatible sizes, measure the circumference of your palm with a tape measure, and check the size chart.