... pack(2pcs/set) 1.PVC material,hot and cold function 2.MSDS,FDA,EN71,Non-phthalates free certificate Small ... if there is a hole in the vinyl. 6.How to make the pad's heat last longer than normal ?1) ... the pad and it gets hot, make sure to squeeze the pack well to get it soft and flexible. This ... , muff, covers , ect. This will make a big difference too. 7. How to reuse ?1) Put the hardend heat pad ...