You may be able to get away with the old glove you used in high school, but the circumference of a baseball is about nine inches while a softball is 12 inches. What this means is you need a deeper, wider pocket to prevent the ball from popping out on a hard liner and to keep your thumb from getting jammed if you squeeze the ball in order to secure it for a tag play. Look for gloves that measure at least 12.75 inches like the Nokona Walnut. [$219; justballgloves.com]