So far, so good! Our last mattress pad didn't completely fit our California King mattress even though it was specifically for that size mattress. We couldn't get it around the edges, so it constantly rode up and bunched up under our sheets (so annoying!). Anytime we tried to pull it back down under the edges of the mattress, the non-stretchy sides of the mattress pad would tear. We haven't had those problems at all with this mattress pad! It fit our California King mattress perfectly and even fit under the edges of the mattress! No bunching up! Plus, the material for the sides of this mattress pad are much more durable and stretchy, so no tearing. Also, even though the mattress pad is waterproof, it's extremely quiet (no plastic rustling noises to wake you up every time you roll over). In addition to all of these great features, you can't beat the price! The next cheapest mattress pads we looked at that seemed to be of comparable quality were at least double the price. This mattress pad is an excellent value, and we've been extremely happy with it so far!