Reduce the risk of your filter freezing with this Handy Thermal sleeve by Sawyer. One size fits the filter in any of the SP124, SP128, SP129, SP131 or SP181 models.
Note** This sleeve will help to prevent your filter from freezing in sub-zero temperatures. This sleeve is an aid to prevent freezing and does not in any way guarantee that the filter will not freeze.
- One size fits the filter in any of the SP124, SP128, SP129, SP131 or SP181 models.