I can't find any of Heather's stirrups on her site, but broadly, as far as I can tell, they are going to a have a broader footplate, rather rounder than conventional ones, and not unlike Icelandic ones except with a rubber tread. They will also be suspended from the stirrup leathers by a loop which makes them suspend at the right angle, meaning that to put your foot in, you do just that, no twisting your stirrup leather, and fumbling and struggling when you lose a strirrup....it's there, facing the right direction, and waiting to receive your foot. Please correct me if I've got that wrong, somebody. Icelandic stirrups have a round foot plate but no rubber tread, and the face in the right direction too. They're a little bit like eventing stirrups. I'm going to try to post a picture, but I have a feeling Wally may have posted it before, in which it will not be allowed to be posted again. But I'll give it a whirl anyway. Apologies if it doesn't work.