Honestly just go buy the SA-903. 5/8 and I purchased size 7 and once the fur matted down they fit perfectly and the soles have even held up well taking them outside to take out the trash or get the mail. The original sound of the Rift-S without those is still way better and that is a shame since it is really not that great. Plus, they are super comfy! As for comfort, 10/10, for sure. The batteries in this thing were strong the entire time. It is well worth the price. Like completely disconnect for about 3 sec. It doesnt fit as secure as a pair of sneakers. An Awl to punch a hole to keep your drill bit from wandering 5.