One might wonder at the utility of buying an IP-68 case for a phone that is itself rated IP-68, namely, the Samsung Galaxy S7. The answer, I think, is, first, that just using the S7 on dry land may unknowingly compromise the IP-68 rating. ("IP" stands for "ingress protection"; 6 is the top rating against dust; 8 is the top rating for submersion in water--Samsung says the S7 is "water resistant to a maximum depth of 1.5 meters," which isn't much, "for up to 30 minutes.See full review