False Martingales are designed to keep the breastplate in place. It is fitted by attaching the stainless steel clip to the small dee at the centre of the girth, and looping the strap onto the fitting on the breastplate. 

This model is made from 25mm (1") wide strapping, and is suitable for use with Classic Driving Harness 

Pony Size 
Adjustable from 63cm (25") - 75cm (29 1/2") 

Cob Size 
Adjustable from 68cm (27") - 80cm (31 1/2") 

Full Size 
Adjustable from 73cm (28 1/2") - 85cm (33 1/2")