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-R™ Classic Soft™ Earplugs 311-6000, Uncorded, 2000 Pair/Case
Disposable Earplugs 3M E.A.R Soft - Box of 200 - Bison Direct
3M™ E-A-R Soft Earplugs, Corded, Yellow Neon, 311-1250, 200-Pair
AETRONIX Saudi ES-01-005 3M Group
3M E.A.R. Soft Fx 3M E.A.R. Plugs Es-01020 (Pack of 200)
3M™ E-A-R soft Yellow Neon Earplugs 36dB
12pair 3M earplug Ear Soft Yellow Neons Ear plug
3M E-A-Rsoft FX Earplugs, 312-1261, Uncord, Class 5
3M 312-1250 Ear Soft Yellow Neons Earplugs (Case of 200
3M Disposable Earplugs 1100, Foam, Uncorded - LSH Industrial Solutions
3M Soft Foam Ear Plugs
3M E-A-Rsoft Yellow Neon Blasts Uncorded Foam Ear Plugs