? Cover the bowl and hold one side, then stretch another side to fit the bowl.? The temperature tolerance of the silicone cover ranges from -40F to 446F approved dishwasher, freezer and microwave.? The temperature tolerance of the silicone cover ranges from -40F to 446F approved dishwasher, freezer and microwave.? Lids can be used in the microwave or oven, but are not suitable for placing on the gas or electricity directly for heating.? Stretch,then press the top of the lid while pulling the tabs to create a vacuum seal.Pull the sides to ensure a perfect fit.? Find a silicone stretch lid which is smaller than the bowl.? Microwave or Oven, because the expanding heat and pressure from container, may result in damage or injury.? Due to the good sealing,food covers allow bowls,cups or other containers to side lay or stack up for saving the space in a freezer.? You had better not completely seal container when you are using in Microwave or Oven.? You had better not completely seal container when you are using in Microwave or Oven, because the expanding heat and pressure from container, may result in damage or injury.