The Active Hands General Purpose Gripping Aid Right Hand comes in 3 sizes: Large, Standard, and Small. The Standard size fits most adults, and the Large size fits those with bigger hands. The Small size is intended for children aged over five and adults with petite hands. To determine the correct size, measure both the narrowest part of the wrist and from the wrist crease to the tip of the middle finger, then refer to the sizing information below or the sizing chart to determine the correct size.