The ornamental design for an elasticband for warming the hand of a user, as shown and described.
FIG. 1 is a front elevation view of an elastic band for warming the hand of a user showing concave edges;
FIG. 2 is a rear elevation view of the elastic band; and,
FIG. 3 is a view of the elastic band placed around the hand of a user, with the concave edges adjacent the palm of the hand.
The broken line showing of the hand of the user in FIG. 3 is for the purpose of illustrating environmental structure and forms no part of the claimed design.