It took 18 months to purchase the Casper Wave and the subsequent mattress protector. So glad I did. The protector fits the mattress beautifully. Nice and tight. I don’t even notice it’s there. It’s simple to wash and dry. I’ve noticed no degradation of materials since purchasing the protector three months ago. And this sucker gets washed bi-weekly. Well worth the investment to protect your mattress but a definite win because you can’t tell it’s present under the sheets like most.