Because being a Ninja Warrior makes you thirsty! Thanks to Ninja\U for their partnership and collaboration on a custom water bottle for the warrior in you! A portion of your purchase goes directly back to the Ninja\U gym. 
 
Details on the Iron Flask water bottle:
 
INSULATED SPORTS WATER BOTTLE: Goodbye sweat! The double wall insulation makes the Iron Flask sweat-free! It keeps your drink COLD for up to 24 hours, and HOT for up to 12 hours. 
3 LIDS: YES, Iron Flask comes with THREE different LEAKPROOF lids. Spout Lid, Flip Lid with a Handle, and a Stainless Steel Lid! *NOTE: The stainless steel lid is plastic from inside and stainless steel from outside*
18/8 PREMIUM STAINLESS STEEL: The Iron Flask is made of 18/8 Stainless steel that is BPA free and non-toxic. It will never leave a metal taste or rust. HAND WASH ONLY WITH SOAPY HOT WATER!
FUNCTIONAL DESIGN: The powder coat exterior finish is a classic. It assures that you stand out with a very durable and elegant bottle. Our logo is now LASER ENGRAVED to assure the highest quality as well.