Silicone is the perfect material because it is hygienic, hypoallergenic, resistant to bacteria and extremely easy to clean with warm soapy water or in the top rack of the dishwasher. Silicone can withstand both hot and cold temperatures and doesn't warp or damage under prolonged exposure. Silicone has the capacity to evenly distribute heat and the ability to cool instantly after heated. Silicone is durable and unbreakable Silicone can be safely used in the microwave, freezer, and in the top rack of the dishwasher