Darning thread from Scanfil, made of cotton
Thin cotton threads that are well suited for repairing and darning on, for example, cotton and linen garments. The threads are wound in groups of 4, so you can cut off the desired length and use 1-4 threads depending on the thickness needed for the repair.
The price is for 1 card
You can get basic darning techniques by signing up for the newsletter (pop-up, or here) or you can find them in the Facebook group MyVisibleMend under "units"
For darning on heels and toes, I recommend using a round object inside, such as a light bulb, fruit, or darning mushroom, which you can buy here in the shop.
(The two light beige colors I ordered are almost impossible to tell apart. I don't know if this is a mistake on the supplier's part, or if that's just how they are, so if you can't tell the difference in the pictures, that's why!)
Good luck!