what are pool noodles made of

Pool noodles are made of polyethylene foam, which is a closed-cell foam made from millions of tiny bubbles pressed together. Polyethylene foam is the primary material used in the construction of a pool noodle. The material doesnt react with water, making it totally safe to use. Polyethylene foam can be difficult to recycle in most places. Despite this, pool noodles have been used as an improvised substitute for commercial pipe insulation.