I use these in my car, which can get to be 140° during our Texas summer.
They are the only rubber bands that have ever held up for more than six months, and I love them. -Kenny

*****

This is the best rubber band I own, so much better than the supermarket ones, 3 times more durable, doesn't get sticky or soften, I use to tie my hair, only this rubber band can withstand such rigors Work, excellent! -Kim

*****

These are packaged in plastic bags containing 4 ounces of them. I bought them to hold down lightweight items like plastic storage containers on the
top shelf of the dishwasher so they don't go flying around during the cycle or turn over and collect wash water. Between the heat, hot water and detergent, it must be a torture test for them. Regular rubber-band-ball rubber bands break down quickly and snap in a week or two. I started using these six weeks ago and have yet to experience a single failure. I am completely satisfied with their performance. -Vance

UPDATE:

Even after a year, none of these that I use daily in my dishwasher have snapped! I've retired a few of them after a year because they get a little stretched out, but none have broken! The only ones I've lost are those that have slipped off their moorings and been digested by the dishwasher. Great product that exceeded my expectations.