WHY CHOOSE BOROSILICATE GLASS STORAGE CONTAINERS?The Isy Bowls are made from 100% recyclable borosilicate glass, which is 2 to 3 times stronger than normal glass. The advantage of using borosilicate glass is twofold. As well as being endlessly recyclable, it is also long-lasting due to its resistance to high temperatures (around 300°C) and thermal shock. As well as being an eco-friendly and durable material, glass is ideal for storing food as it retains flavour. You can therefore use it in the freezer, microwave, oven, bottle warmer and bain-marie (or any other appliance that steam heats). This makes it really versatile, suitable for a variety of uses. No need to wait for the food to thaw out in the refrigerator before heating – saving you really precious time! Really practical, the Isy Bowls are also dishwasher-safe and can be sterilised. No leakage possible with their airtight silicone lids. Plus,they do not stain when they come into contact with food (such as carrot or tomato).