JBS Bamboo 2-pack o-neck t-shirts. If you haven't yet tried bamboo underwear, we can definitely recommend it. Bamboo underwear is extra soft and combined with the organic cotton, it makes the t-shirt incredibly comfortable to wear. Soft to wear for adults as well as kids. JBS underwear is the first underwear in the world fully FSC certified from bamboo to finalized product. JBS is using a unique production method reusing water making it a highly sustainable product with low impact on our planet.