These "roll down" earplugs are constructed of a foam which expands and then conforms to the shape of the ear canal with body heat to make a particularly good seal.

NRR 33 dB- highest Noise Reduction Rating available
Self-adjusting foam provides low pressure with excellent attenuation
Dermatologically safe polyurethane foam has been tested and rated non-irritating to the skin, but does contain a trace amount of latex
Note that the NRR may overestimate the hearing protection provided during typical use.
3M recommends reducing the advertised NRR by 50% for estimating the actual amount of noise reduction provided
Priced by the pair