material is so hard like very strong thin cardboard like leather it doesn't wrap well around my arms because i have some biceps due to muscles that don't even stay on my forearm. The first time I ran it I only tightened it to keep it on my feet and it ended up chafing and actually peeling off several layers of skin - two months later I still have a scar that I probably have gonna be for a while . My last bracelet was less than $5 and fell apart after about two dozen runs, but at least it never hurt me, the material was flexible and held up without overtightening and/or injuring yourself.
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