i couldnt see anything on the label about washing them, and i dont have the packaging. so, can i machine wash them?

Yes mate done mine with no issues wash and dry on a radiator ok.
Bat.

what temperature? i take it a cool wash?

I usually do mine at 30deg.

yeah just a 30/40 degree. Then on the Rad. Then re-sew them 😉

Actually I think they are most excellent knee warmers and I wear mine quite a bit once spring starts and I discard the leggings (wearing them with leggings would look wrong don't you think?).

They should come with a little mesh bag. Put them in that before washing or the velcro sticks to everything

they did come in a mesh bag, but i've lost it. ill do them in an old pillow case or something 😀