Silicone lube is made from silicone polymers, so it does not dry out and water does not wash it away. Both of its sides come from that: it keeps going long after water-based lube has given up, and it ruins a silicone toy.
What it is used for
Water. In the shower, the bath or a pool, water-based gel rinses off in seconds, while silicone keeps working. The second use is long sessions without breaks to reapply, since there is nothing in it to evaporate.
What it ruins
Silicone toys. The lube and the toy are related polymers, and on contact the surface of the toy softens, turns sticky and loses its finish for good. Glass and metal toys are fine. Latex, polyisoprene and polyurethane are not harmed by silicone, so it is safe with condoms.
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. Dimethicone and cyclopentasiloxane are the usual base. A bottle typically runs about $12 to $25 for 2 to 4 oz at drugstores and big online marketplaces: more than water-based, but it goes several times further. It washes off with warm water and soap, not water alone.
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Frequently asked questions
Why can't I use silicone lube with silicone toys?
The lube and the toy are related polymers. The surface of the toy softens and turns sticky, and the damage is permanent. A condom over the toy, or a glass or metal toy, avoids it.
Is silicone lube safe with condoms?
Yes, with latex, polyisoprene and polyurethane condoms. Silicone does not break these materials down, unlike oil.
How do I wash silicone lube off?
Warm water with soap. Water alone slides over it, which is why it lasts in the shower.