This Bamboo Style Pin Straight Smoothing Balm from Alterna is a delightful styling product that is suitable for straightening both wavy and curly hair. This ingenious balm is enriched with eco-certified bamboo extracts for sustainable style. rn This pin straight smoothing balm is highly nourishing, containing thermal protectants that smooth and seal the cuticle to help to protect your hair from any heat damage caused by styling tools. Your hair will be left sleek and straight after use, frizz-free and full of shine.