8.5mm Knitted, Soft Elastic.
I have been getting complaints because the original 1/4" elastic I had was really thin with a picot edge. Closer to 1/8" wide but didn't hold up well in the washer & dryer under high heat.
So this elastic is metric & just a bit wider than 1/4" & more narrow than 3/8". No picot edge.
Still knitted & very soft on your ear but substantial enough to go around your head. Holds up much better to hot water & hot dryers.
I'm thinking we will be washing our masks at least every other day for months..... hence a more robust elastic.