Silipint: Humbler 32OZ - Lid and Straw - With a Silipint handled Humbler in hand, you can go where no other drinkware can…Everywhere. This 32 oz Straw Tumbler rivals the vacuum sealed, insulated tumblers like no other. That s because Silipint tumblers are made from naturally occurring silica (basically sand): a durable, non-toxic material that is flexible, durable, and can handle the heat. It s not only eco-friendly it , unbreakable materials makes it almost indestructible. It won t scratch, dent, chip, fade or shatter. So go ahead, take this tough-as-nails straw tumbler anywhere and put it to the test - whether it's iced coffee, hydration on the go, a refreshing smoothie, or an extra thick milkshake, this 32oz unbreakable companion never takes a break so you never miss a moment. Silipints are dishwasher, microwave, freezer and even oven safe. They can hold hot and cold beverages, they're durable, and will never wear out