Why are the Equivital sensor belts only supplied with a 3 month warranty?

The sensor belts are a semi-consumable item. With use and repeated washing the silver in the fabric ECG electrodes degrades affecting the quality of the signal. Our warranty is 3 months (25 washes). 

The sensor belts contain integrated sensing technology for the both the ECG and the respiration rate and should therefore be treated with care. Overstretching the sensor belt may result in damaging these sensors, and rendering the sensor belt unusable.