Libbey 15645 Duratuff 24oz Panel Tumbler Glass - Shatter-Resistant Drinkware for Iced Tea, Soda & Cocktails - Perfect for Restaurants, Bars & Home Entertaining

I typically keep a pitcher of smoothie in the fridge and I just want to chug it down quickly in the mornings. The fridge makes it too cold to chug, so I pop it in the microwave to warm it up slightly. I wanted glasses big enough to hold 20 oz. comfortably, good quality and made of glass, not plastic which might leach chemicals when heated.These glasses are perfect. Heavy duty, so they don't chip easily. They are designed to hold 24 oz. up to the brim, so 20 oz. fits comfortably. The rim of the glass is nice and smooth, and the whole glass is very solid and well-made. The inside of the glass is nice and smooth too.They are just slightly under 7 inches tall, so make sure you have enough clearance to fit in your microwave/shelves. The bottom of the glass is pretty much flat, so when they are drying in your dishwasher it won't collect a puddle of water that takes forever to dry. They don't nest, so don’t try to stack them or they can get stuck together and can be cracked or chipped when you try to pull them apart. They are a tad heavy, but with "heavy-duty", that comes with the territory. They are nice-looking too.I know I'm just talking about drinking glasses here, but I couldn't be happier with these. I bought 3 cases, that's 36 glasses... I drink a lot of smoothies :)