Chuckit Hydrofreeze Gel Ball is ideal for fun in and out of water. Holds and releases water Bright hi-vis colour Silicone freezer shell to keep dogs cool Chuckit! Hydrosqueeze and Hydrofreeze toys are designed to hold and release water during play, helping to keep dogs cool on hot Summer days. Bright orange and blue for high-visibility on water or land. Easy fill design, includes silicone freezer shell. Internal reservoir that you freeze to slowly melt over time & release water. Added play dynamic helps keep dogs cool. High-visibility on water or land.