Are these breathable or air-tight?

I'd say breathable. They have an elastic hem so they're easy to put on. They're not like Tupperware. Still, they're very convenient. I just wouldn't use them for long-term storage or liquids.

How does food stay fresh if cotton material?

I don't leave it covered indefinitely. Haven't had any problems if I use stuff up within a few days. I love them, wash up great and I don't use nearly as much plastic wrap or tinfoil.

Is this actually made of only cotton? One of the picture descriptions says wax coated & waterproof??

The bowl covers aren’t lined with wax, but it is a silicone? Binding to cotton top. They was very easily by hand, dry quickly. I’m very pleased I bought them. I’ll give them a 5*rating!

Color	as the pictures show
Brand	CHENGU
Style	Leaves
Item Weight	5.29 Ounces
Shape	Round
Number of Pieces	10
Is Dishwasher Safe	No
Closure Type	Elastic
Is Microwaveable	Yes
Manufacturer	Chengu
Part Number	Bowl Covers
Item Weight	5.3 ounces
Package Dimensions	9.33 x 8.31 x 1.14 inches
Country of Origin	China
Item model number	Bowl Covers
Size	one size
Item Package Quantity	10
Included Components	10 x Reusable bowl covers
Batteries Included?	No
Batteries Required?	No

10 Pieces Reusable Bowl Covers in 5 Size Elastic Cloth Fabric Food Storage Bowl Covers Cotton Fabric Cover for Kitchen Proofing Food Fruits Leftover, 4 to 12 Inch

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