Icelandic stirrups are made of metal and have a different shape than conventional stirrups.  Their outer side is bent forward, while the inner side is bent backwards. This shape means that If the foot falls out of the stirrup unintentionally, it can quickly be picked up again. However, this only works if the Icelandic stirrup is attached to the saddle the right way round. Although these stirrups were not developed specifically as safety stirrups, they can be described as such. Of course you can also use these stirrups for riding horses other than Icelandic horses. After all, equipment used in Western riding is now sometimes used by riders who ride in the classical English style too.