Not all weighted blankets are created equal, and the ones that you see Kevin buying are cheap, low quality crap made in China with the incorrect stuffing material. Most of them are also WAY too heavy and can cause you pain. 95% of the weighted blankets people buy these days are trash, and yes, you can't wash most of them without ruining the blanket itself due to the sand or whatever cheap stuffing filler they're using.
If you want an
actual weighted blanket that's freaking amazing and you wash it like any other blanket, then buy from the original company that created the idea decades ago. They are all hand made in the USA by a Veteran supporting company:
https://magicweightedblanket.com/
Yes, it's more expensive than the crap you can buy on Amazon, but that's because it's an actual quality blanket that is made to last and you don't have to worry about breathing in toxic shit from China or hurting your body because it weighs too much. I bought a weighted blanket from this company almost a decade ago and it still looks and feels brand new. I wash it whenever I wash my normal blankets and have never had a problem. I have also bought several friends and family members weighted blankets from there and they love them and don't sleep with any other blanket anymore.
I also cannot go back to regular blankets, it's hard to explain if you're never used one (or only ever used a cheap shitty one). Literally feels like you're being gently hugged and it feels nice if you have sore muscles or feel sick, etc. Also, if you have cats, they freaking love them.