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Boot Doctor Boot Stretch Spray B03967. Boot stretch spray is designed to spray inside of your cowboy boots to quickly offer more room and a better boot fit. It is a fairly inexpensive product that is also easy to use. Be sure to read the label carefully, as not all products are intended for all types of leather! You will see some stretch in the leather of your cowboy boots right away. Boot stretch spray is intended to stretch leather across the top and sides of the foot and also in the shaft of the boot. 6.5 OZ Spray Can.