Material and safety: Made from flexible, foodgrade silicone for longlasting use. The sheath offers strong elasticity and a soft feel while containing no harmful substances. Comfortable drinking: Soft bite design requires minimal pressure to open, giving a gentle, controlled sip. Ideal for steady hydration during activity without awkward tugging or spluttering. Easy maintenance and hygiene: Each pack includes four replacement silicone sheaths so you can rotate or worn parts regularly. Fresh sheaths reduce buildup, odors, and the risk of leaks from damaged valves. Quick, tool installation: Simply remove the old bite valve and slip the sheath into place—no need to alter or your backpack's drinking tube. Installation is fast and reversible. Compatibility and performance: Designed to work with common hydration bladder bite valves and drinking tubes. The sheath preserves valve function and flow while improving comfort and longevity. Use scenarios: Hiking and camping: an old, cracked bite valve on trail to restore reliable hydration without unpacking your system. Cycling and running: Keep a soft, responsive mouthpiece for quick sips while on the move, reducing distraction and maintaining momentum. Gym and travel: Swap sheaths between uses for a cleaner mouthpiece and consistent performance during daily workouts or trips. What's included: Four silicone bite valve sheaths per package. Why you need it: Regular replacement of small wear items like bite valves keeps your hydration system hygienic, leak, and comfortable—this set makes that upkeep simple, affordable, and effective.