What is the best material for powerbands?  Natural latex or synthetic?

Question:

What is the best material for powerbands?  Natural latex or synthetic?  Also, what companies are manufacturing it in 9/16” or 5/8” sizes?  I live in Thailand (rubber/latex capital of the world), but can’t seem to find anything but surgical tubing and condoms here wink


Submitted from:

Koh Samui, Thailand