someone mentioned before, etymotics earplugs or sth. from HUNG brothersget sponge earplugs from guardian or something.less then 4 dollars.
If you're 25 bucks, head down to simlim and buy the musician's earplugs. good quality shit.
maybe u cant hear the hi hat as well? lol its possible, but i think it's most impt to protect the drummer's ears