I strongley recommend getting rid of C.E.P.'s OEM"foam" tips provided with the kit. Instead, order 5-pairs of triple-flange rubber inner-ear plugs from
www.Etymotic.com Etymotic's replacement tips are excellent - durable, seal the ear canal perfectly, do not wear out, are washable, and basically work about 1,000x better than C.E.P.'s goofy & very uncomfortable foam tips.
Buy a C.E.P. system - BUT definitely get rid of CEPs foam ear tips.