Oreocereus leucontichus

This name is synonym to O.hendriksenianus, just a different form. The plants have nice yellow or sometimes red spines and pretty 'hair'.
By some reason hair-like spines on cacti are often associated with cold protection, when in reality they serve much more important role, assisting in moisture collection. In areas with regular fog thin hair-like spines collect tiny droplets of water from air, making it accumulate at the plant base, were it eventually gets to it's roots.