Solivagant Protective Silicone Bottle Boot, 2 Packs, Compatible With Most Wide Mouth Sports Water Bottles From 12-40 Oz. Bpa Free, Anti Slip Bottom Cover. (Small, Frost/Black)compatible with most Wide Mouth (mouth diameter: 228A) sports water bottles from 12 oz to 40 oz Available in 2 sizes Small boot (boot diameter: 275A) for bottle of size 12-20 ..