How many times can I wear it before purchasing a new one?

3-5 years for a Vest Garment, depending on how much you wear it and the care it is given. 
3 years for Cooling Packs. After 3 years the Cooling Packs start to lose their cooling ability. They will still work but you will find that they don't last as long, the plastic wears down and they might leak. 

If you have Cooling Packs that are over 3 years, this is the perfect time to use our recycling program and get a new set at a deeply discounted price. 

For a more in-depth answer check out the blog How many years will my ThermApparel UnderCool Cooling Vest Last?