What is a martingale and what is it used for?

martingale Elastic Running Martingale Attachment with round elastic, 8 mm in diameter and rings spaced apart by means of a leather strip that slides up and down the…

Elastic Running Martingale Attachment with round elastic, 8 mm in diameter and rings spaced apart by means of a leather strip that slides up and down the… martingale strategy Running Martingale · Additional information · Related products · Breastplate Side Fit with Running Attachment · Breastplate with Elastic and Running Attachment