Water-based lube is a gel made of water plus a thickener. Of all the bases, it is the only one that works with every toy material and every kind of condom, with no exceptions at all.
When it works
When you do not know what a toy is made of. When a condom is involved, latex or any other kind. When the sheets matter: water-based lube washes out in a normal cycle and leaves no greasy marks.
Where it falls short
It dries. The water evaporates and absorbs, and the glide fades after a few minutes. The fix is a few drops of water on the same spot, which revives the gel without a fresh pump. In the shower or bath it rinses away almost at once, so it is the wrong pick there.
What to check on the label
In the US, personal lubricants are regulated by the FDA as medical devices, so the box should name the product as a personal lubricant and list its ingredients. Glycerin makes the gel thicker and slightly sweet, and some people tolerate it less well, which is why glycerin-free versions exist. A basic bottle usually runs about $8 to $20 for 2 to 4 oz at drugstores and big online marketplaces, and larger 8 oz bottles cost less per ounce.
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Frequently asked questions
Is water-based lube safe with condoms?
Yes, with all of them: latex, polyisoprene and polyurethane. It is the only base with no exception for any condom material.
Why does water-based lube dry out faster?
The water evaporates and absorbs into skin. A few drops of water on the same spot bring the glide back.
Can I use it in the shower or bath?
Briefly. Water rinses it away almost at once. Silicone lube lasts in water, as long as the toy material allows it.