Most are made from silicone or plastic. Reusable water balloons are commonly sold as silicone, while expandable breathing balls are typically described as plastic.
Sizes vary by type: reusable water balloons often collapse to about 3 inches across, while expandable breathing balls are described as expanding from roughly 5.6 inches up to about 12 inches.
Fill by dunking the balloon in water; a self-sealing top closes when you remove it from the water. Many sets include a waterproof, sealable travel bag for drying and compact storage.
They act as visual breathing guides and calming fidgets, used for slow-breathing practice, stress relief, emotional regulation, and classroom calm-down or social-emotional learning activities.
Age labeling varies by product: examples include "Suggested Age: 3 Years and Up," "Suggested Age: 12 Years," and some listings labeled "All Ages."
Many are shipped deflated or can be flattened for compact storage and easy transport; some listings also include a waterproof travel case for carrying and drying.
One listing highlights aerodynamic side fins intended to improve throw accuracy and make tossing easier; those same items are described as durable for repeated outdoor play.
Durability is noted for both types: reusable water balloons are described as made from durable silicone for long-lasting use, while expandable breathing balls are described as made from durable plastic designed to withstand regular use.
