Comes From: Manufactured in the UK, though the brand first launched in the USA.
Cost: £575 for a double, £650 for a king
Trial Period: 100 nights
Construction: Four-layer construction including an open-cell comfort top layer, memory foam layer, adaptive transition foam layer, and support foam base (24 cm height).
Casper was one of the first of this type of mattress to hit the market in the USA, where it launched in 2014, and it's been in the UK for a couple of years now. Celebs love Casper: Leonardo DiCaprio is an investor, and Kylie Jenner a big fan. The construction combines four layers of foam, though there's no breakdown of the depth of each. You'll get a long trial and a 10-year warranty, and delivery takes one to two business days, shipping via UPS.
Read our full review of the Casper mattress here.
Note: All the above mattresses come in a variety of sizes from single to superking, but for ease we've compared prices of popular double and king options.