Package of four replacement silicone bite valve sheaths — designed to keep your hydration system working reliably and comfortably. Key benefits Maintain hydration performance: Regularly replacing worn bite valve sheaths helps preserve consistent sip flow and reduces the chance of contamination or reduced function. Comfortable sipping: Softtouch silicone provides a pleasant, loweffort sip during intensity activities so you can drink without interrupting your pace. Costeffective spare set: Four sheaths per give you replacements on hand when valves wear out or become soiled. Product attributes Material: Soft silicone bite valve sheaths for a comfortable mouthfeel and reliable sealing. Compatibility: Fits most hydration bladders and valve styles, including systems with 360degree rotatable valves. Function: Replacement sheath for the bite valve component; intended for routine replacement to maintain hydration efficiency. Practical use scenarios Long hikes or backpacking: Swap in a fresh sheath after extended use to keep your drinking valve hygienic and functioning on multiday trips. Cycling or running: Comfortable silicone sheaths make quick sips easier during sustained exercise without slowing your pace. Gym or daily commute: Keep spare sheaths for regular replacement to avoid degraded flow or uncomfortable biting from worn valves. What you get Four silicone bite valve sheaths per for routine replacement and continued hydration system performance.