PERFECT FIT AND FEEL: The Pantheon Apple Watch replacement bands are made from a soft leather material that will not irritate your wrist while wearing it. The 38mm will fit like a S/M (Small / Medium) band and the 42mm are slightly longer to fit like a M/L (Medium / Large) band. Please see our sizing chart to make sure that you buy the correct size. QUALITY PARTS AND MATERIALS: Made of high quality materials that will not fade or become easily worn down from every day use. We do not recommend wearing these on your Apple iWatch Series 3, 2 or Nike Edition into the pool or shower. The soft leather will not react well to excessive sweat or moisture. For sweatproof and waterproof bands, please find the Pantheon silicone bands listing. NOTICE: This product is not manufactured or endorsed by APPLE (Alphabet, Inc). We are a third party company and manufacturer of high quality Apple certified products (like battery cases). These bands are not apple certified (MFI).