They do keep your feet a little bit warm nothing too drastic, just cozy really if anything. Not my boots that I can wear any time of year. Purchased a refurbished unit, in two months it no longer holds charge for more than a day, even in standby mode. The belt material gets stuck in the lower portion of the buckle where it opens and closes and is ripping the belt causing it to frey. It really does work! Thank you anker but I won’t be buying any more of your products ✌🏽 So I had her try My pair of these. Cabe recalcar que para aquellos que piensan comprar el producto para utilizar auriculares de iPhone en Xbox, los de iPhone no son compatibles. I have purchased Vionic slippers before I would suggest you size down for a good fit. It felt nice to wear and it was very complementing to my shape.