Made Of Ultra-Soft Silicone, These Teats Are Specially Designed To Mimic The Natural Form Of A Mother’S Nipple For The Comfort Of Your Baby. Extremely Soft And Elastic To Make Your Baby Feel At Ease And Secure. The Air Valve System Built Within Can Also Reduce Air Flowing Into Baby’S Stomach And Prevent Colic. Lengthened Air Valve On Base Allows For Constant Flow Of Liquid And Less Ingestion Of Air, So Prevents Colic. Specially Designed To Reduce The Fur.