The Chuckit! Hydrofreeze ball is designed to hold water and be frozen for a cold, refreshing way to play. Each ball comes with a special sleeve that you slide onto the ball before placing into the freezer. This innovative sleeve helps to keep the water in place inside the ball until fully frozen. Hydro water toys help to keep dogs cool in warm spring and summer weather it's the coolest way to fetch! Bright orange color provides high-visibility on water or on land. Available in medium and large.