Instead of buying a whole new earmuff, you can save money with the Howard Leight by Honeywell Hygiene Kit for Thunder T1/T1H/T1F Earmuffs. This kit includes one pair of our specially-designed ear cushions and one pair of foam inserts. Together they can extend the lifespan of your safety earmuff and improve its performance. Replacing the old ear cushions is easy: just pop out the old ones and snap the new ones into place. Replacement is recommended every six months; more frequently if your safety earmuff sees heavy use in the workplace.