5mm jack but I prefer the adaptor because it is much easier to adjust the game and chat volume using the adaptor. Wearing while I work, sweat as well as the weather gets on it. I was outside of the return window, so now I am money out for an unusable product. well done radioddity The bottoms were dirty and the foot bed had clear footprints. I will only be using them for surfboards and they appear to be more than adequate for that purpose. Dont know if this is a glitch, but I was disappointed that the text itself did not convey over to the band without the image. But, I switched to another pair and the worked perfectly. These slippers are COZY, WARM, SNUG that I forgot to take off before heading out shopping! They love these slippers!