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2. Buoyancy aid - Wikipedia

   en.wikipedia.org/wiki/Buoyancy_aid

   The foam used is typically closed cell PVC (polyvinyl chloride), although some manufacturers are now starting to use less toxic and more recyclable materials. Older designs used vertically aligned ribs of foam all around the body, but more modern designs typically feature front and rear slabs of foam buoyancy, with the sides left clear to allow ...

3. Pull buoy - Wikipedia

   en.wikipedia.org/wiki/Pull_buoy

   Pull buoy. A pull buoy or leg float is a figure-eight shaped piece of closed-cell foam used in swim workouts. Swimmers place the buoy between their thighs or their ankles to provide support to the body without kicking their legs; this allows the swimmer to focus on training only their arms [1] and developing both endurance and upper body strength.

4. Syntactic foam - Wikipedia

   en.wikipedia.org/wiki/Syntactic_foam

   Syntactic foam, shown by scanning electron microscopy, consisting of glass microspheres within a matrix of epoxy resin. Syntactic foams are composite materials synthesized by filling a metal, polymer, [1] cementitious or ceramic matrix with hollow spheres called microballoons [2] or cenospheres or non-hollow spheres (e.g. perlite) as aggregates.

5. Rescue buoy - Wikipedia

   en.wikipedia.org/wiki/Rescue_buoy

   The three major components of a rescue flotation device (RFD) are the lanyard, float, and harness. The lanyard and harness can trip up the lifeguard during the entry run, so care must be taken upon handling the RFD. The lifeguard must carry the rescue buoy until the beach visitors are not at risk of getting hurt. [1]

6. Biofoam - Wikipedia

   en.wikipedia.org/wiki/Biofoam

   A foam is considered open-celled if at least two of its facets are holes rather than walls. [18] In this case the entirety of the load on the foam is on the cross-beams that make up the edges of the cell. [6] If no more than one of the walls of the cell are holes, the foam is considered closed-celled in nature. [18]

7. Foam - Wikipedia

   en.wikipedia.org/wiki/Foam

   Foam rubber is a type of open-cell foam. A closed-cell metal foam. Closed-cell foams do not have interconnected pores. The closed-cell foams normally have higher compressive strength due to their structures. However, closed-cell foams are also, in general more dense, require more material, and as a consequence are more expensive to produce.