I would have expected them to stay comfortable and last longer than three months for $28 so based on my experience, I can?t recommend buying these slippers. Our bike tires are 27 1/2 and 29. Design aerodinamico curvo 3D a 4 lati. Also, the photoshops of items onto them in the stock photos is hilarious. The feature is called "sidetone" and it refers to the ability to hear ones own voice through your speakers when speaking into your mic. I have at least 12 pairs of shoes/slippers on it as well! I tried all three sizes and they all are uncomfortable. My only complaint is that my head is a little big and after about 5 hours, I need a 30 minute break because my ears feel a little pinched. I suggest getting a 1/2 size larger than usual or perhaps a wide width. Even my bags and hats were put there.