My Green Mattress offers a 20-year warranty and a 120-night trial. The Kiwi is definitely a firmer mattress, but I think it's comfortable, and my children all say it's the most comfortable mattress they've slept on.

Photograph: Birch

Birch Natural Mattress (11-Inch)

$1,358 at Birch

We still like the Avocado more, but this is a good alternative for some side sleepers. WIRED reviewer Louryn Strampe says she sucks at sleeping. “I toss and turn all night. My blankets need to be arranged specifically. I can't deal with light, and I require a sound machine to run in the background. I didn't expect a mattress to change much, but this one from Birch pleasantly surprised me.” It's an eco-friendly mattress made by Helix, the maker of our other favorite bed.

The Birch is made of natural latex and wool, with individually wrapped coils that lend a plush and bouncy experience without feeling too squishy. It's great for stomach and side sleeping, and it's comfortable enough that Strampe could actually sleep on her back. A small, visible indented outline formed where she and her partner each slept, with a ridge between them, but after a year it was still bearable. If it's warm in your room at night or you're a hot sleeper, the Birch may not be for you.

Photograph: My Green Mattress

My Green Mattress Organic Latex Topper

$299 at My Green Mattress (Queen)

A new mattress is a huge investment, and sometimes all you need is a little refresh for your existing mattress. If your current mattress isn't sagging, you might be able to get a whole new feel just by adding a mattress topper like this organic latex topper from My Green Mattress.

This topper is two inches of certified organic latex wrapped in an organic cotton cover, with a zipper so you can remove the latex pad (though I am not sure why you'd want to). It's lightweight but does a good job of staying in place even without any straps to hold it down.

This is a reasonably firm topper, compared to something like a down or wool topper, but it still contours nicely to your body and is comfortable even if you sleep on your side. Lying on my stomach or back, I don't even touch my actual mattress anymore with this on top. I do when I roll on my side, but just barely. All of which is to say, you can bring a whole new life to your bed without spending a fortune.

Photograph: Avocado Green Mattress

Avocado Alpaca Wool Mattress Topper

$1,329 at Avocado

This Alpaca wool topper is one of the softest things I've ever slept on. If you like being enveloped in a cocoon of fluffiness, this is the topper for you. It's not cheap, but put this on your mattress and you'll feel like you're in a five-star hotel. 

Avocado's Plush topper is made of baby Alpaca wool (that's a reference to the softest wool on the animal, not its age) with an organic cotton cover. It's about two inches thick, but in this case, you definitely do sink down to your mattress so it's more of a luxury add-on than a way to rejuvenate an older mattress. Avocado's return policy applies here as well, so you can try it and return it within the first 100 days.