Booster Cooling Pack Set - for use with Sports, Classic, Concealable, and High-Visibility Cool Vest

I have Multiple Sclerosis and I have been using Glacier Tek cool vests for approximately 15+ years. Its the only way I have been able to be outside during the summer months.The new packs are smaller and now you place 2 packs in each slot. I have to say I was disappointed in the length of time they stayed cool and at times its harder to sometimes put 2 packs in their slot. That being said, I tried the booster packs and have been pleasantly surprised at the length of time my vest stayed cool! It now stays as cool as their old style single sleeve ice pack but make sure the booster pack isn't close to your skin so it doesn't give you freezer burn. I personally prefer the old style over this new 2 pack system that really needs the booster pack to be as effective as their original single single pack.