Here's a colourful summer size sorting activity, and if you laminate the pieces you can use them over and over again. Cut out the bright and cheerful pictures, laminate if you prefer, then ask the children to sort them onto the mats.
Summer Big and Small Size Sorting
Give the children some sorting practice from smallest to largest (or vice versa) with these colourful beach balls. You can laminate the beach balls to make them a bit stronger and for repeated use if you prefer...
Sort these pretty shells by size from smallest to largest, or largest to smallest. Once you've had a few goes with these shells you could try sorting some real ones next time you go to a beach?