The back print features a riddle-style picture called "Rookaru," a pictorial game from the Edo period. A T-shirt dyed with bamboo charcoal, which is said to have antibacterial, deodorizing, and moisture-regulating properties. Botanical dye is a hybrid plant dye that combines pigments extracted from plants with minimal chemical dyes. ROCBCD stands for Recycle Organic Cotton Bamboo Charcoal Dye. 100% organic cotton. 6oz loop wheel jersey, 50% virgin and 50% recycled. Soft and durable original Japanese body made using a loop wheel knitting machine. 10.5 x 10cm pocket. Bias-sewn binder neck that shrinks on the inside and expands on the outside. Available in two colors: bamboo charcoal gray and black.