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Warm heart is a improvement of the existing winter closing. There is a problem when two people walking together. It will be cold if one of them wants to arm in arm with another person. Because her hands are exposed in the outside. The improvement of warm heart is the design of a pocket on each side of the arm. If so, the exposed hands can be infixed into the pocket and will be warm. Even you can put your wallet into this pocket. Indeed, it is a safe position for wallet. No one can steal from your armpit.
li, liquan / huang, xiaoyu