1. Silicone bite mouthpiece. Highflow bite valve autoseals after each sip, no leak, rolled up or flattened when it Empty to drink water 2. This soft collapsible 250ml water bottle convenient for daily, travel, or outdoor sports 3. The 8oz Soft Flask designed especially for outdoor and indoor sports activities like a marathon, running, hiking, cycling, gym, and also for travel, is compact and built for a long life for durable use 4. The folding water bottle designed specifically to carry and dispense carry gels, water, electrolytes, or your own nutrition mix and is top rack dishwasher safe as well for easy cleaning 5. Don't steam sterilize or steam the soft flask, as it will cause deformation, just wash it with warm water, Don't put it in the disinfection cabinet for disinfection.