Barcoo Bridle

All Mac Tack Bridles are made using USA BioThanes Super Heavy option

BioThane USA makes Standard and Super Heavy webbing. 
Standard = 2.5mm thick 
Super Heavy = 4mm thick (This is still soft and very flexible) 

When it comes to horse bridles, you just can't beat USA Super Heavy

If you would prefer BioThanes Standard/Light Weight option - this is completely fine but you will need to request it.