9 mm wide leash made of original BioThane tape. 
 
The advantage of the BioThane tape is that it is absolutely waterproof and easy to clean.
 
It is a product made of polyester covered with a TPU coating /thermoplastic polyurethane elastomer/, the features of which are:
 
excellent flexibility
high flexibility 
high abrasion resistance,
high resistance to cracking and tearing,
good resistance to dynamic load,
good impact, vibration and shock damping properties,
good to very good weather resistance,
resistance to oils, fats and a number of solvents,
good resistance to microbes,
does not absorb odors
feels very much like natural leather