WHICH Best Buy Mattress 2019 According to the latest WHICH? report, the Casper Essential mattress is one of the best mattresses they've ever tested. According to WHICH, our mattress flew through their tough tests with ease. Why Casper? We're not a just mattress brand, we're a sleep company and our goal is to improve your sleep. All our mattresses and sleep products are designed based on customer feedback and 100s of tests and prototypes to create the perfect product. Designed in the Casper labs in Silicon Valley by Casper engineers and sleep experts but manufactured locally in the UK, we're changing the way people sleep. Manufactured in UK To ensure high quality standards and durability, our mattresses are all manufactured in the UK. Free returns & risk free trial We give you 100 nights to try a Casper mattress. Don’t love it? We’ll pick it up free of charge and give you a full refund. No strings attached. 10 year warranty We're so confident that our mattresses are long lasting, high quality and durable that we offer a 10 year warranty on them. Exceptional customer service Snooze specialists are available seven days a week to answer any question under the moon.