Dyson Define & Refresh Styling Duo – Travel Size Hair Styling & Conditioning Spray Set (2 × 50ml). Chitosan Multi-Use Styling Spray (50ml). 1 × Dyson Chitosan Multi-Use Styling Spray (50ml). Compact enough to fit into your handbag, gym bag, or travel luggage, this duo is ideal for refreshing your hair before work, after exercise, or while travelling.