The Collaborative International Dictionary of English v.0.48:

Huarache \Hua*ra"che\, huaraches \hua*ra"ches\, Huaracho
\Hua*ra"cho\, n.; pl. Huarachos. [Amer. Sp., also guaracha,
   guarache, huarache, prob. of Mexican origin.]
   A kind of low-heeled sandal with the upper consisting of
   interwoven leather strips; -- usually used in pl. [Southern
   U. S. & Mex.]
   [Webster 1913 Suppl. +PJC]

WordNet (r) 3.0 (2006):

huaraches
    n 1: a sandal with flat heels and an upper of woven leather
         straps [syn: huarache, huaraches]