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These work well to keep the heat and humidity in and reduce evaporation for sous vide cooking. They are a bit of a bother to take out of the water and pack up, but it's really not unpleasant.

These allow the water to heat more quickly, reduce evaporation, and adapt to any size vessel.

The water balls certainly do the job of reducing water evaporation during prolonged sous vide cooking.

After cooking for almost 48 hours at 140 degrees, I think I only added (3) cups of water extra during that time. These helped conserve the heat very well.

I used these balls with my new Joule Sous Vide circulator. This is a very versatile and clever product: it is reusable and suitable for any size/shape container. Another plus is that you have easy access to the food in the water bath without having to undo plastic wrap or remove lids. It comes with a mesh bag that serves double duty to both store and easily dry the balls. I live in an apartment so this product is great for me because it also doesn't take much storage space and it adapts to whatever pot I am using for the sous vide cooking.

Don't know how great they truly are at insulating the sous vide bath, to be honest. I think the balls are great in that is you insulate with a towel, you don't have to worry about the towel failing into the sous vide as it will rest on top of the balls.

I love these. They really keep do a great job. I turned off my Sous Vide took the food out, and served the meal. I returned to the kitchen for clean up 2 hours later, and the water was still hot!. These are great!

these work great - the first time we used them we cooked a large roast for 18 hours and lost very minimal amount of water.While we haven't had a problem with floating bags they would be great for that too.