Universal Siliskin Wideneck silicone covers for glass bottles and metal containers are designed to fit a variety of large and small glass baby bottles and slide on and off for easy cleaning. These safe, silicone sleeves help prevent breakage of glass baby bottles, and are a translucent silicone which allows you to see measurements and liquid in the bottle. Siliskins are hypo allergenic, have no open pores to harbor bacteria, are dishwasher and microwave safe, and can be boiled to sterilize. Small Wideneck Siliskins come in Red, Sky Blue, Teal Green, and Yellow, and fit the Born Free 5oz glass bottle, Nuk Wideneck 120ml glass bottle, 12oz Kleen Kanteen, and 10oz Sigg. Large Wideneck Siliskins (MSRP $8.95) come in Green, Light Blue, Lilac, and Yellow, and fit the Born Free 9oz glass bottle, Nuk Wideneck 240ml glass bottle, Fogo Straw Sippy by Thermos, 13.5oz Sigg, 12oz Soda/Beer can, and even mason jars.