Because it's not necessarily cool inside the Iron Man armor.

Regardless of the incredibly advanced technology operating Tony Stark's personal super-suit, the internal climate mechanics are a little....twitchy.

Thankfully, and because Tony Stark realizes his very slight design flaw, he carries the Iron Man Nalgene Kids 12oz Water Bottle in a secret compartment to assure in-armor hydration.

Made from durable, clear plastic, this 12oz Iron Man water bottle for kids features -- first and foremost -- an image of Iron Man flying above his very own logo.

Spinning it around, we see another image of Iron Man plus graduated markings assessing your fluid level in milliliters.

You want more features regarding this handy Iron Man bottle? 

More features regarding your brand-new Iron Man water bottle:

• Features a one-handed push-button for easy open/close.
• Leakproof closure swings open to reveal high-flow drinking spout!
• Closing apparatus also acts as a handle!
• Locking bail for ultimate insurance against leaks!
• Dishwasher safe.
• Do NOT microwave.
• NOT intended for hot or carbonated beverages.