The silicone bases at the bottom of your Swig product are meant to be removable. If we used adhesive to secure them to the cup they would no longer meet our dishwasher safe criteria. The silicone base allows our products to go in the dishwasher without breaking the vacuum seal, which helps insulate them and maintain the temperature. It also keeps our products from slipping or falling over and allows for a quieter set-down!
The silicone base is pressure sensitive and can be reassembled if it should happen to come off or get water underneath, which sometimes may occur in the dishwasher.