The Apple Watch case, the Milanese Loop, the Modern Buckle (leather and FineWoven ), the Leather Loop, the Ocean Band, the Alpine Loop, the Sport Band, the Sport Loop, the Solo Loop, the Braided Solo Loop, and the Woven Nylon contain trace amounts of acrylates and methacrylates from adhesives. Acrylates and methacrylates are found in many consumer products that come in contact with the skin, such as adhesive bandages. Some people may be sensitive to them, or may develop sensitivities over time...
For FineWoven bands, including Magnetic Link and Modern Buckle:
iPhone FineWoven Wallet with MagSafe
iPhone case— FineWoven and TechWoven material
Magnetic Link, Modern Buckle (with FineWoven ), Leather Link, Modern Buckle (with leather), Milanese Loop, Link Bracelet, and Hermès leather and knit bands are not water resistant....