These 'seem to be' a nylon knit, finely cut & serged approximately 1940-1960. They are a stable knit (not knitt-ed but double knit-like) fabric of quality.

These are in a collection of prized baby items shown in photo #7, having been carefully stored  in a large, sturdy box (shown underneath the vinyl snap case).

The brand is unknown; ones like these could not be found for comparison. These are in excellent condition!

They're soft all around; nothing scratchy. Bootie laces are original to these booties!

If you have any questions, please contact the seller before purchasing. Thank you!