Photo courtesy of Cool Universe
Stuff Your Bra
These falsies come with an added benefit. Cool Girls bra inserts are filled with non-toxic crystals and covered in cotton fabric. You soak them in water for about 20 minutes, wait another few for the fabric cover to dry, then pop them in your bra. The company says they usually last four to five hours. Coldfront pouches accomplish the same goal, and while they aren't specifically meant to be worn in your undergarments, we think they look and feel like silicone breast implants. They're filled with a non-toxic polymer gel and come in a carrying case that keeps them cool for up to 12 hours. You reactivate them after use by storing the case in the freezer overnight.