Activatable laminate structures

A wrap comprising:

• an inner substrate that ruptures upon the application of a certain tensile force in a longitudinal direction;
• a first and outer substrate that are capable of extending at least about 30% in said longitudinal direction upon application of said tensile force without substantially rupturing, wherein said inner substrate is positioned between and bonded to said first and said second outer substrates to define multiple pockets aligned in series, wherein each of said pockets has an upper pocket region and a lower pocket region;
• a first reactant contained within said upper pocket region of at least a portion of said pockets;
• and
• a second reactant contained within said lower pocket region of said pockets that also contain said first reactant, wherein said first reactant and said second reactant are capable of intermixing when said inner substrate is ruptured, said intermixing causing said reactants to undergo an endothermic or exothermic reaction.

A method for heating or cooling a body part of a user, said method comprising:

• i) providing a wrap, said wrap comprising:
• a) an inner substrate;
• b) extensible first and second outer substrates, wherein said inner substrate is positioned between and bonded to said first and said second outer substrates to define multiple pockets aligned in series, wherein each of said pockets has an upper pocket region and a lower pocket region;
• c) a first reactant contained within said upper pocket region of at least a portion of said pockets;
• and
• d) a second reactant contained with said lower pocket region of said pockets that also contain said first reactant;
• ii) activating said wrap by stretching said wrap in a longitudinal direction until said inner substrate ruptures, said rupturing of said inner substrate causing said reactants to intermix and undergo an endothermic or exothermic reaction, wherein said first and said second outer substrates remain substantially unruptured;
• and
• iii) placing said activated wrap adjacent to a body part.