About half size bigger. These are lovely slippers and are very comfortable. The upper bootie portion is a comfortable close fit to the ankle, which keeps me warm, but not such a close fit that would make putting them on difficult. Had to wiggle in my 12 month olds little fat feet ) The JBL connect app is so finicky. However am not sure it would still be comfortable after hours of wearing it, since its a bit tight on the first toe Dont have to worry about losing sound quality on the adapter, the signal is digital format when going through the adapter so any adapter quality will do its job. Way To big To tell the truth I dont know of any cons with these. The corporate greed of the mining company is painted in the starkest terms.