3M 1110 UF foam ear plugs (corded version of the 3M 1100 ear plugs) are the stiffest of the poly-urethane foam ear plugs. For those who like the feel of UF, but want the stiffness of PVC (which makes insertion easier)
3M E-A-Rsoft Ear Plugs Noise Reduction 33dB Foam Disposable
3M™ EARsoft™ SuperFit™ 30 Uncorded Earplugs,Poly Bag of 200 312
3M™ E-A-Rsoft™ Yellow Neons™ Uncorded Earplugs 312-1250, SLC₈₀
3M 4-Pack Disposable Earplugs - 92050-4-10DC
ES-01-011A 3M E.A.R 3M E.A.R Soft Series Blue, White Disposable
1100 3m, Ear Plugs, Uncorded, 37 dB Noise Rating
3m Ear Soft Yellow Neons, Earplugs (20 Pcs)
3M E.A.R SOFT YELLOW NEON EAR PLUGS BX/250
3M E-A-R Soft Large Corded Earplugs 23db CL4 200PK 311-1251
3M 1110 Corded Foam Ear Plugs (100 Pack)
3M - 3M™ E-A-Rsoft™ Yellow Neons™ #3M 12063
3M 92059H80-DC Orange And Purple Soft Disposable Earplugs 80 Pair
3M™ E-A-Rsoft™ (391-1254) SuperFit Ear Plug Dispenser Refill