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.This Wolf tee is designed and printed right here at the Preserve. It features our former Alpha, Chito. 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.