These racing saddles are for use on Thoroughbred
The inset is an exercise saddle, the larger is an actual race saddle. The
race saddle has only one girth
strap on each side, compared to a regular English saddle
that has two or three. An 'over girth' would be strapped over the seat of the saddle so that it is very secure.
The total width of the saddle from the bottom of each flap and across the seat is 20 inches. They are very tiny and lightweight. The jockey does not sit in the saddle, but stays perched over the horse's shoulders.
You might come across a saddle like this at a flea market or
auction sale. These saddles are not suitable for general riding.
The race horse's owner did the final check on the overgirth before the jockey was lifted into the race saddle.