Customers say these protective sleeves fit perfectly and provide excellent protection for glass bottles. Many use them in showers where they prevent slipping and breaking, with users appreciating the improved grip on wet hands. Common feedback includes praise for the quality and peace of mind they provide. Several mention using them for various products including shower items and bottles stored in RV fridges. While most love the protection and fit, some note sizing challenges and wish more sizes were available. One customer raised concerns about the material composition.