The Olaplex No.4 Fine Shampoo & Weightless Nourishing Mask Duo is designed specifically for fine hair types. Powered by the brand’s patented Bond Building Technology™, the lightweight duo works to cleanse, strengthen and visibly volumise strands without weighing them down. Set Contents: No.4 Fine Bond Maintenance Shampoo 250ml A high-performance hair cleanser that gently lifts away impurities, excess oil and product build-up while infusing hair with weightless hydration. Weightless Nourishing Mask 200ml The five-minute treatment is infused with coconut oil to condition and smooth hair without compromising volume. It provides weightless nourishment to reduce the risk of breakage over time.