The name EMU really says it all.  These are definitely worth the money, especially if you live in a that get really hot or really cold -- as I do.  They keep your feet warm, but do not allow the feet to sweat due to the use of real lamb's wool.  I love the sole of these slippers -- they can be worn outside without damaging  the suede.  It's worth the extra money to have something that will probably last for years.