As Joe R said...chin strap is totally wrong. I would also pull the liner tongues up out of the shell and check the visor seams from the inside, using a flash light, look for any signs of glue/contact cement. I think the visors have been glued on. You can also examine the exterior visor stitching lines for areas where there is no thread visible but the visor fits close to the shell. No thread but close fit means glue! I would also not invest any money in this piece.