What do Leonardo DiCaprio, 50 Cent and pro basketball player Carmelo Anthony have in common? They’re all investors in Casper – the pioneering mattress company that created the ‘bed-in-a-box’ concept.

Designed by engineers in San Francisco and built over here in the UK, the concept has been such a hit that Casper was featured in TIME’s Top 25 Inventions of 2015 – the American magazine’s list of innovations making the world better and smarter.

There’s certainly no doubting Casper’s ‘smart’ credentials. The mattresses are technical tour de forces constructed from four layers of foam. The first layer is an open-cell top layer full of tiny pores to let excess hot air escape, keeping you cool and comfortable. Next up, there’s a layer of high-density memory foam, which supports pressure points. The third is designed for deep comfort: a transition layer that allows for even weight distribution. And at the bottom is a supporting base layer, which strengthens the three above and adds to its long-lasting durability.

If you’re not a fan, they’ll pick it up and give you your money back. This is probably one decision you won’t need to sleep on.

Casper’s celebrity status isn’t just restricted to its investors, either. Its clientele include sports stars Odell Beckham, Anthony Watson and Leigh Halfpenny – guys who need a decent night’s sleep.

To try one out, you don’t need to worry about heading to a showroom and awkwardly lying on top fully clothed. Instead, Casper are so confident you’ll like its product that you have 100 nights to test it out. If you’re not a fan, they’ll pick it up and give you your money back.

This is probably one decision you won’t need to sleep on.

Delivered to your door in 1-2 days, Casper will even take away your old mattress. Prices from £350; casper.com