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)
Earplugs - 3M E-A-RSoft Superfit Disposable Corded, (200 Pairs
3M E-A-Rsoft Ear Plug Noise Reduction 33dB Yellow Neon Foam 1/Case
3M™ Ear Plugs 1100, 30 PR/PK (94-105 dB)
3M Soft Foam Disposable Ear Plugs, Orange, 92077H8-DC, 32 Db, 8
3M 312-1250 Ear Soft Yellow Neons Earplugs (Case of 200
3M E-A-Rsoft Ear Plugs Noise Reduction 33dB Foam Disposable
3M™ E-A-Rsoft™ FX™ Uncorded Earplugs, Poly Bag, 312-1261, 2000
3M Disposable Earplugs 1100, Foam, Uncorded - LSH Industrial Solutions
3M E-A-R soft FX Earplugs (Box of 200)
3M Classic Foam Ear Plug 28 SNR - Box of 250
3M 32 dB Soft Foam Earplugs Assorted 4 pair - Ace Hardware
3M™ EARsoft™ SuperFit™ 30 Uncorded Earplugs,Poly Bag of 200 312
3M EARSNRB EAR Soft Yellow Neons Refill Ear Plugs (Pack of 500