Arm Pinnies are a healthier, safer, more effective and fun way to distinguish teams and players! They are easy to put on by simply sliding up an arm. An elastic wrist opening & elastic, adjustable Velcro closure at the top ensure a snug, no-slip fit. The colorful motion-flow indicator flags on the side provide increased visibility. Because they are worn on the arm, they are significantly cooler to wear compared to vests. Easily accommodates children ages 4-13; one size fits most children and some adults too. Machine wash, cool dry. Sold individually.