Materials listed include natural rubber and foam for inflatable floaties, PVC for some baby/toddler floats, and EVA or closed‑cell foam for swim bars and pull buoys.
Descriptions highlight features that promote active swimming: designs that support a horizontal body position, allow natural arm and leg movement, and use adjustable safety belts or straps. Some products also include multiple air chambers or chest supports to keep the child supported while enabling kicking and paddling.
Rinse foam pull buoys in cool, non‑chlorinated water after each use, air dry them on a towel, and avoid extended exposure to direct sunlight to help prevent material damage.
Some foam aids are described as closed‑cell foam that resists water absorption and withstands UV, chlorine, and salt exposure. EVA foam is also noted for durability and for not chafing the skin.
Notices include statements such as "Not US Coast Guard Approved," and some swimtrainer descriptions reference meeting "ASTM F963 US Toy Safety Standards." Many listings also state these are not life‑saving devices and should be used under supervision.
Pull buoys immobilize the legs and provide lift, shifting focus to the upper body. They help build upper‑body strength, improve body alignment and symmetry, and encourage proper hip rotation.