Safe for Food: These shower caps are made of food-grade PE plastic; microwave safe; the reusable bowl covers make cleaning up after cooking or dinner leftover storage so much easier | Sourdough Bread: These shower caps are helpful for keeping the moisture of the dough in the bowl, preventing it from drying out during the proofing, and creating the ideal environment for dough fermentation | Easy to Use: The plastic bowl covers fit over a majority of bowl and plate sizes; easy to remove and reseal repeatedly; using food covers is a great idea for quick use and a great alternative to tinfoil and clingfilm | Good Elasticity: The reusable shower caps can be stretched up to 42cm, covering plates and bowls of various shapes; the elastic band tightly adheres fresh keeping bags to the bowl, preventing dust from entering and keeping food fresh | Sturdy and Reusable: These bowl covers are sturdy and anti-puncture, and not easy to rip; plastic bowl covers can be repeatedly cleaned and you can reuse many times; handy for bread proofing and storing leftovers, a must-have kitchen gadget