Glass Is Chemical Free, Odor And Stain Resistant, Long Lasting And Easy To Clean, Which Makes It An Ideal Material For Baby Feeding Bottles. Like All Our Closer To Nature Bottles, These Have The Most Breast-Like Teat Ever Made, That Flexes And Feels Like Mum, To Make Switching Between Breast And Bottle Feeding A Stress-Free Experience. These Baby Safe Glass Bottles Are Made From Premium Borosilicate Glass Which Is Bpa, Phthalate And Toxin Free. Glass Baby Bottles Are Also Naturally Stain Resistant And Easy To Clean. The Glass Bottle Is Made From Sustainable, Long Lasting Material, Plus It Can Be Recycled After Use Too.