In Chinese philosophy Yin is the feminine or negative principle symbolized by darkness, cold, sadness, while Yang is the masculine symbolized by light, warmth and joy. It is believed that these two strong energies fuse into matter and that is what makes the world. In respect to Wolves it may symbolize the struggles they have surviving in a crowded world and the joy that their pack brings them there. This Wolf tee is designed and printed right here at the Preserve. This Wolf t shirt is made of 6oz weight 100% cotton preshrunk jersey knit. Machine wash warm inside out and tumble dry medium. See size chart for a better fit. Makes a great Wolf gift.