The "wide" version basically allocates more real estate in the upper, making the leather upper able to expand further, thereby accommodating a wider foot. JBL informed me that Trusted Tech Canada, the seller, is not an authorised JBL seller and my one-year warranty was void because of this. Among other uses, very recommended for drivers. The hooks in general work great. So, I thought I would return them. The bass is so punchy. He is assertive but not pushy. I wear a size 8 but I got these in the M(9-10) so they would be a little roomy. The rubber isn?t as sturdy as the original piece and it still fell off a few times. Size up ONE FULL Size.