What is a worm blanket? What is it used for?

Worm blankets are made of a water-absorbing, air-permeable and light blocking fabric.
They are placed on top of the worm bedding and have multiple functions:
The blanket minimises light reaching the worms, allowing them to feed right up to the top of the compost day and night.
Moist blankets prevent the upper layer from drying out, which can attract ants into the system Moist blankets help maintain the proper moisture levels for the worms. Worm blankets maintain warmth within the Subpod during winter months.