goodluck on the bred 4s, im scared to unds mine as well. The air bubble on mine are extremely clear, but dont know if i want to take the risk
about the walking around and trying ito break them in. its not a great indicator either, unless u wear them outside. Took my chances on '94 blk cement 3s ,i wore them around the house probably more than 10x, walking, pushing my weight down on them, and pressing on the midsoles with my fingers, after all thatthere were no signs of cracking or crumbling. But once i wore them out, they were great for a while. Wore them to school, made it to class, then as i waswalking back to my car i could feel the left midsole dragging as i walked.. good thing my class wasnt very far from the parking lot.
long story short, tried to break in '94 3s by wearing the indoors, all went well, finally wore them out, left shoe cracked opened and crumbled, right shoebegan to crumble
and now im left with those '94 black cement 3s sz 8 if anyone is interested in a restoration project