Instruction: Extract information from the supporting document to answer the given question.

Input:
Question: Can you really use these to cover food while it's cooking in the microwave?   It looks like it would melt or explode and cause a problem.
Document: Where have you been all my life? This lid is just great for all those bowls and dishes that go in the microwave or refridgerator, that you would normally cover with plastic wrap. I use them for lids on my simmering pots and then throw them in the dishwasher and they look like new. My new favorite kitchen thing!
It is shaped as a lily pad and looks like art. I really enjoy it. It sucks on to the glass ball or pot and creates the vacuum to keep the content fresh. Good stuff.
I have a couple of these now and have bought several for gifts. They are really cool! When you don't have/can't find a lid for leftovers - they work great and I've used them while cooking in small sauce pans on my stove.Wish they would come up with more designs other than flowers. Would love to see a polka dot one.
Received this as a gift and I use it every day. Makes a fantastic microwave cover, seals dishes for the fridge or freezer like magic.everyone who sees it wants one. I have purchased more to give as gifts twice and already need.more!
These silicone lids are wonderful. I bought two different sizes and am planning to buy the rectangle banana leaves.I'm using them to cover food when dining al fresco. They are terrific in the microwave (good bye to use cling wrap). Hubby uses the large one as a spatter screen for his Sunday bacon. They pop into the dishwasher for clean up...and they're cute.
I bought 6 of the 8&#34; ones to give as Christmas gifts. I already had one for about 6 mos and loved it. I use it as an easy cover for anything I heat up in the microwave. I think everyone could use one----hence I bought a bunch so they would have this great invention.
I bought these after seeing the advertized in a cooking magazine - great idea for those odd bowls instead of using plastic wrap. Unfortunately, they didn't really work for me. I tried on glass containers with a small rim (Corelle cereal bowl, small ramekin), and a plastic drinking glass. I could create a seal initially, but it quickly failed and would end up just "sitting" on top of whatever container I was trying to seal, especially if put in the fridge.
These smaller lids are great for leftovers, etc. When cooking, they really seal and I use them in the oven all the time. Thank you, Charles.
I cannot say enough positive things about this product. I works like a charm. Seals the dish but has small ventilation holes so using in the microwave is no problem. Keeps spaghetti and chili from splattering all over the microwave. We hung it by its clever tab on the inside of the bowl cabinet where we can grab it all the time.
I use it to cover leftovers and to cover measuring cups when melting butter. It prevents the splatter. My biggest problem with it is that I can't keep it clean because I use it so much! !
Answer: I use these for everything.  When in the microwave, I don't seal it tightly and have never had a problem.  I just love them.  Use them on cans, cups, pans, casseroles--I like them so much more than the covers that fit pans and casseroles.  Only thing is that in the fridge, if the overhang gets bumped, it can break the seal.  No biggy.  One second, one-hand fix.  Did I say I love them?