ENGO Patches retain their low-friction property when they get wet. ENGO Blister Prevention Patches have been reformulated to hold up better against sweat and moisture within your footwear than ever before. Whether you�re caught in the rain during a run or you simply sweat (a little or A LOT), our redesigned ENGO Patches have been tested to withstand water submersion (installed on standard insole materials) for 10 minutes with only a 25% average reduction in peel strength (resistance to peel from the material onto which it is installed). Our new ENGO Patches are better than ever to live up to the rigorous demands of our customers!