The Duo 25oz Non-Insulated Bottle is a rugged water bottle designed for cyclists. It features a strong stainless steel construction and food-grade silicone parts free from BPA, BPS, BPF, and phthalates. The patent-pending valve provides a cyclist-specific flow rate. Colored variants have an anti-slip silicone exterior. It includes an interchangeable lid (Bivo One lid sold separately).