The most compelling theory is a glove loom of sorts. Variations are found to this day.

I would want Susan Storm/Violet Parr’s invisibility/force feild thing. You can kind of fly with it

Im pretty sure they are talking about getting rechargable AA/AAA/C/D batteries.

A lot of my work gear is sort of pricey but it keeps me safe and working. Usually pays itself off within a month or two and will last at least a few years.