Cold Cup Insulated
Are double walled insulated coffee tumblers microwavable?
It's from Borders bookstore. It doesn't say anywhere on the tumbler as to whether it is or not and I'm a bit worried it may crack if I try to heat water for cocoa in it.
Unfortunately I'm at work and a regular coffee cup is just to hard to carry with out spilling here and gets cold too fast on your desk.
Usually if it doesn't say, that means it is OK to put in the microwave, however, I would advise against this because there still is a chance of crackage(is that a word?).
Try microwaving the hot water with the regular cup, and then just pour it into your tumbler when you are done.
Also, look to say if it isn't dishwasher safe. If it can't hold up in a dishwasher, then don't try it in a microwave!
Cold Coffee Is Gross - Keep It Warm with a Heated Mug
Find Cold Cup Insulated Collectibles On eBay Below:
 STARBUCKS Coffee Venti To Go Custom Cold Cup TUMBLER 20 oz Insulated NEW Clear US $31.99 
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 BRAND NEW STARBUCKS SET OF 2 ICED COLD CUPS VENTI 24oz TUMBLERS DOUBLE INSULATED US $31.85
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