Hi Boxer,
Is it possible that what looks like a white stripe is actually a trick of the light (glare, reflection, blown highlights, etc.) ?
Here's an interesting resource. . . a page of "safety shoes and boots" and boot covers.
https://www.buyingdirect.net/Leg_Toe_Foot_Guards_Chaps_Overshoes_Safety_Supplies_s/36.htm
It's a small selection of various types of footwear/shoe covers/protective devices. The USDA has certain standards/requirements for footwear worn in a food processing/slaughter/packing facility.
I had no idea there was such a range of products. . . some of them look like the lower extremities of C3PO (of Star Wars fame)![]()
I think that the stripe looks even across like its a strap, not a reflection. But its all pretty blurry. Looking for a match is amazingly difficult, even though it seems like it would be a common sort of design.