Why does my bamboo base layer have a funny smell when new?

New bamboo viscose fabric often retains a slight chemical odor from the manufacturing process, particularly from the sodium hydroxide and carbon disulfide used in viscose production. This is normal and harmless but should dissipate after 1–2 washes. Always wash new bamboo base layers in cold water with gentle detergent before first wear. If the chemical smell persists after 2–3 washes, it may indicate lower-quality manufacturing with incomplete chemical recovery—consider returning the product. High-quality bamboo from reputable brands should have minimal new-fabric odor.